| January 23, 2012 |
30.25% |
32.25% |
| January 16, 2012 |
30.00% |
32.00% |
| November 14, 2011 |
29.50% |
31.50% |
| October 24, 2011 |
28.95% |
30.95% |
| July 18, 2011 |
28.75% |
30.75% |
| July 4, 2011 |
28.50% |
30.75% |
| May 9, 2011 |
28.75% |
30.75% |
| May 2, 2011 |
27.75% |
29.75% |
| April 18, 2011 |
27.25% |
29.25% |
| April 11, 2011 |
27.15% |
29.15% |
| April 4, 2011 |
26.90% |
28.90% |
| March 28, 2011 |
26.75% |
28.75% |
| March 21, 2011 |
26.60% |
28.60% |
| March 14, 2011 |
26.40% |
28.40% |
| March 7, 2011 |
25.90% |
27.90% |
| February 28, 2011 |
25.40% |
27.40% |
| February 14, 2011 |
24.90% |
26.90% |
| February 7, 2011 |
24.80% |
26.80% |
| January 31, 2011 |
24.60% |
26.60% |
| January 24, 2011 |
24.40% |
24.40% |
| January 17, 2011 |
23.90% |
23.90% |
| December 20, 2010 |
23.70% |
23.70% |
| December 6, 2010 |
23.40% |
23.40% |
| November 29, 2010 |
22.90% |
22.90% |
| November 22, 2010 |
22.40% |
22.40% |
| November 15, 2010 |
22.10% |
22.10% |
| October 12, 2010 |
21.50% |
21.50% |
| September 20, 2010 |
21.20% |
21.20% |
| April 19, 2010 |
21.00% |
21.00% |
| April 5, 2010 |
20.85% |
20.85% |
| January 11, 2010 |
20.60% |
20.60% |
| November 9, 2009 |
20.25% |
20.25% |
| November 2, 2009 |
19.75% |
19.75% |
| October 26, 2009 |
19.25% |
19.25% |
| August 31, 2009 |
18.50% |
18.50% |
| August 17, 2009 |
18.25% |
18.25% |
| August 10, 2009 |
18.00% |
18.00% |
| June 22, 2009 |
17.25% |
17.25% |
| June 15, 2009 |
16.50% |
16.50% |
| June 8, 2009 |
15.75% |
15.75% |
| May 18, 2009 |
14.80% |
14.80% |
| May 4, 2009 |
14.55% |
14.55% |
| March 30, 2009 |
14.75% |
14.75% |
| March 9, 2009 |
14.75% |
17.10% |
| February 23, 2009 |
14.80% |
17.10% |
| February 16, 2009 |
15.00% |
17.10% |
| February 9, 2009 |
15.75% |
17.10% |
| January 26, 2009 |
16.25% |
17.10% |
| January 12, 2009 |
17.25% |
17.25% |
| January 5, 2009 |
19.00% |
19.50% |
| December 22, 2008 |
19.50% |
19.50% |
| December 8, 2008 |
19.75% |
19.75% |
| December 1, 2008 |
20.75% |
20.75% |
| November 24, 2008 |
23.80% |
23.80% |
| November 17, 2008 |
24.00% |
24.00% |
| November 3, 2008 |
26.00% |
26.00% |
| October 27, 2008 |
26.25% |
26.25% |
| October 20, 2008 |
27.0% |
27.30% |
| October 13, 2008 |
27.50% |
29.30% |
| October 6, 2008 |
28.75% |
30.60% |
| September 29, 2008 |
28.75% |
31.20% |
| September 22, 2008 |
28.75% |
31.10% |
| September 8, 2008 |
29.25% |
34.20% |
| September 2, 2008 |
29.25% |
34.40% |
| August 25, 2008 |
29.25% |
35.90% |
| August 18, 2008 |
29.45% |
35.90% |
| August 11, 2008 |
29.75% |
37.90% |
| August 4, 2008 |
30.25% |
39.40% |
| July 28, 2008 |
30.75% |
41.50% |
| July 21, 2008 |
31.25% |
43.20% |
| July 14, 2008 |
31.25% |
43.30% |
| July 7, 2008 |
30.50% |
42.80% |
| June 30, 2008 |
30.50% |
41.30% |
| June 23, 2008 |
30.50% |
42.90% |
| June 16, 2008 |
29.75% |
41.30% |
| June 9, 2008 |
29.25% |
40.20% |
| June 2, 2008 |
29.25% |
41.80% |
| May 19,
2008 |
27.25% |
35.10% |
| May 12,
2008 |
26.25% |
32.60% |
| May 5,
2008 |
26.25% |
32.70% |
| April 28,
2008 |
26.25% |
32.90% |
| April 21,
2008 |
26.25% |
31.90% |
| April 14,
2008 |
25.50% |
30.30% |
| April 7,
2008 |
25.50% |
29.80% |
| March 31,
2008 |
25.50% |
29.70% |
| March 24,
2008 |
25.50% |
30.60% |
| March 17,
2008 |
24.50% |
28.50% |
| March 9,
2008 |
22.50% |
25.70% |
| March 3,
2008 |
21.50% |
22.90% |
| February 25,
2008 |
21.50% |
22.70% |
| February 18,
2008 |
20.75% |
22.20% |
| February 11,
2008 |
20.75% |
22.00% |
| February 4,
2008 |
20.75% |
22.70% |
| January 28,
2008 |
20.75% |
24.3% |
| January 18,
2008 |
20.75% |
24.4% |
| January 14,
2008 |
20.75% |
26.0% |
| January 7,
2008 |
20.3% |
25.5% |
| January 1,
2008 |
19.90% |
25.2% |
| December 3,
2007 |
19.90% |
| November 26,
2007 |
19.85% |
| November 12,
2007 |
19.2% |
| November 5,
2007 |
18.75% |
| September 24,
2007 |
18.5% |
| July 9, 2007 |
17.9% |
| March 5,
2007 |
17.5% |
| February 26,
2007 |
16.25% |
| February 19,
2007 |
15.95% |
| February 5,
2007 |
16.25% |
| January
15,
2007 |
15.95% |
| October
16,
2006 |
16.85% |
| October
2,
2006 |
17.0% |
| September
18,
2006 |
17.5% |
| September
11,
2006 |
17.95% |
| August 28,
2006 |
18.25% |
| August 21,
2006 |
18.45% |
| August 14,
2006 |
19.3% |
| July 17,
2006 |
18.45% |
| May 15,
2006 |
17.95% |
| April 24,
2006 |
18.25% |
| April 17,
2006 |
17.75% |
| April 10,
2006 |
17.25% |
| April 3,
2006 |
16.95% |
| March 13,
2006 |
16.75% |
| March 6,
2006 |
16.25% |
| February 20,
2006 |
15.5% |
| January 23,
2006 |
15.9% |
| January 9,
2006 |
16.6% |
| December 19, 2005 |
16.35% |
| December 12, 2005 |
15.95% |
| December 5, 2005 |
15.7% |
| November 28, 2005 |
16.2% |
| November 21, 2005 |
16.3% |
| November 14, 2005 |
16.6% |
| November 7, 2005 |
16.9% |
| October 31, 2005 |
17.9% |
| September 26, 2005 |
18.5% |
| September 19, 2005 |
17.45% |
| September 2, 2005 |
17.95% |
| August 22, 2005 |
15.5% |
| August 15, 2005 |
14.75% |
| August 8, 2005 |
14.5% |
| July 25, 2005 |
14.25% |
| July 18, 2005 |
14.95% |
| June 27, 2005 |
14.25% |
| June 20, 2005 |
13.95% |
| June 13, 2005 |
13.65% |
| June 6, 2005 |
12.95% |
| May 23, 2005 |
12.5% |
| May 16, 2005 |
12.7% |
| May 2, 2005 |
13.25% |
| April 25, 2005 |
12.95% |
| April 18, 2005 |
13.25% |
| April 11, 2005 |
13.75% |
| April 4, 2005 |
13.25% |
| March 21, 2005 |
12.5% |
| March 14, 2005 |
11.50% |
| March 7, 2005 |
11.25% |
| February 28, 2005 |
10.95% |
| February 21, 2005 |
10.5% |
| January 31, 2005 |
10.95% |
| January 24, 2005 |
10.75% |
| November 15, 2004 |
10.4% |
| November 8, 2004 |
10.95% |
| October 25, 2004 |
11.65% |
| October 11, 2004 |
10.95% |
| October 4, 2004 |
10.5% |
| September 27, 2004 |
9.95% |
| September 20, 2004 |
9.5% |
| August 30, 2004 |
9% |
| August 23, 2004 |
8.75% |
| August 16, 2004 |
8.25% |
| August 2, 2004 |
7.95% |
| July 19, 2004 |
7.5% |
| June 07, 2004 |
7.25% |
| May 31, 2004 |
7.45% |
| May 24, 2004 |
7.25% |
| May 17, 2004 |
6.95% |
| May 10, 2004 |
6.5% |
| March 15, 2004 |
6.0% |
| February 23, 2004 |
6.5% |
| February 16, 2004 |
6.25% |
| January 26, 2004 |
5.95% |
| January 19, 2004 |
5.5% |
| January 12, 2004 |
5.25% |
| December 22, 2003 |
4.75% |
| November 24, 2003 |
4.5% |
| November 17, 2003 |
4.25% |
| October 20, 2003 |
4.0% |
| October 13, 2003 |
3.8% |
| September 29, 2003 |
3.5% |
| September 15, 2003 |
3.75% |
| September 1, 2003 |
4.5% |
| August 18, 2003 |
3.9% |
| June 9, 2003 |
3.75% |
| May 26, 2003 |
3.9% |
| May 12, 2003 |
4.5% |
| April 14, 2003 |
4.75% |
| March 31, 2003 |
5.75% |
| March 19, 2003 |
7.75% |
