| January 1, 2024 - Present | $.67 |
| January 1, 2023 - December 31, 2023 | $.655 |
| July 1, 2022 - December 31, 2022 | $.625 |
| January 1, 2022 - June 30, 2022 | $.585 |
| January 1, 2021 - December 31, 2021 | $.56 |
| january 1, 2020 - December 31, 2020 | $.575 |
| January 1, 2019 - December 31, 2019 | $.58 |
| January 1, 2018 - December 31, 2018 | $.545 |
| January 1, 2017 - December 31, 2017 | $.535 |
| January 1, 2016 - December 31, 2016 | $.54 |
| January 1, 2015 - December 31, 2015 | $.575 |
| January 1, 2014 - December 31, 2014 | $.56 |
| January 1, 2013 - December 31, 2013 | $.565 |
| April 17, 2012 - December 31, 2012 | $.555 |
| January 1, 2011 - April 16, 2012 | $.51 |
| January 1, 2010 - December 31, 2010 | $.50 |
| February 1, 2009 - December 31, 2009 | $.55 |
| August 1, 2008 - January 31, 2009 | $.585 |
| March 19, 2008 - July 31, 2008 | $.505 |
| February 1, 2007 - March 18, 2008 | $.485 |
| January 1, 2006 - January 31, 2007 | $.445 |
| September 1, 2005 - December 31, 2005 | $.485 |
| Feb 4, 2005 - August 31, 2005 | $.405 |
| Jan 1, 2004 - Feb 3, 2005 | $.375 |
| Jan 1, 2003 - Dec 31, 2003 | $.360 |
| Jan 21, 2002 - Dec 31, 2002 | $.365 |
| Jan 22, 2001 - Jan 20, 2002 | $.345 |
| Jan 14, 2000 - Jan 21, 2001 | $.325 |