| April 1 – June 30, 2012
|
6%
|
| January 1 – March 31, 2012
|
6%
|
| October 1 – December 31, 2011
|
6%
|
| July 1 – September 30, 2011
|
6%
|
| April 1 – June 30, 2011
|
6%
|
| January 1 – March 31, 2011
|
6%
|
| October 1 – December 31, 2010
|
6%
|
| July 1 – September 30, 2010
|
5%
|
| April 1 – June 30, 2010
|
5%
|
| January 1 – March 31, 2010
|
5%
|
| October 1 – December 31, 2009
|
5%
|
| July 1 – September 30, 2009
|
5%
|
| April 1 – June 30, 2009
|
6%
|
| January 1 – March 31, 2009
|
7%
|
| October 1 – December 31, 2008
|
8%
|
| July 1 – September 30, 2008
|
8%
|
| April 1 – June 30, 2008
|
9%
|
| January 1 – March 31, 2008
|
9%
|
| October 1 – December 31, 2007
|
9%
|
| July 1 – September 30, 2007
|
9%
|
| April 1 – June 30, 2007
|
9%
|
| January 1 – March 31, 2007
|
9%
|
| October 1 – December 31, 2006
|
9%
|
| July 1 – September 30, 2006
|
9%
|
| April 1 – June 30, 2006
|
8%
|
| January 1 – March 31, 2006
|
8%
|
| October 1 – December 31, 2005
|
7%
|
| July 1 – September 30, 2005
|
7%
|
| April 1 – June 30, 2005
|
7%
|
| January 1 – March 31, 2005
|
7%
|
| October 1 – December 31, 2004
|
7%
|
| July 1 – September 30, 2004
|
7%
|
| April 1 – June 30, 2004
|
7%
|
| January 1 – March 31, 2004
|
7%
|
| October 1 – December 31, 2003
|
8%
|
| July 1 – September 30, 2003
|
8%
|
| April 1 – June 30, 2003
|
7%
|
| January 1 – March 31, 2003
|
7%
|
| October 1 – December 31, 2002
|
7%
|
| July 1 – September 30, 2002
|
7%
|
| April 1 – June 30, 2002
|
7%
|