| 2025-01-01 | 2.586 | DT | |
| 2024-05-01 | 2.409 | DT | |
| 2022-10-01 | 2.254 | DT | |
| 2020-10-01 | 2.11 | DT | |
| 2019-05-01 | 1.984 | DT | |
| 2018-05-01 | 1.866 | DT | |
| 2016-08-01 | 1.763 | DT | |
| 2015-05-01 | 1.671 | DT | |
| 2014-05-01 | 1.584 | DT | |
| 2012-07-01 | 1.497 | DT | |
| 2011-05-01 | 1.421 | DT | |
| 2010-07-01 | 1.356 | DT | |
| 2009-08-01 | 1.299 | DT | |
| 2008-07-01 | 1.257 | DT | |
| 2007-07-01 | 1.199 | DT | |
| 2006-07-01 | 1.158 | DT | |
| 2005-09-01 | 1.124 | DT | |
| 2004-07-01 | 1.095 | DT | |
| 2003-07-01 | 1.061 | DT | |
| 2002-07-01 | 1.02 | DT | |
| 2001-07-01 | 0.986 | DT | |
| 2000-05-01 | 0.945 | DT | |
| 1999-08-19 | 0.916 | DT | |
| 1999-05-01 | 0.904 | DT | |
| 1998-08-20 | 0.875 | DT | |
| 1997-11-07 | 0.861 | DT | |
| 1997-07-20 | 0.832 | DT | |
| 1996-09-09 | 0.82 | DT | |
| 1996-05-01 | 0.808 | DT | |
| 1995-05-01 | 0.779 | DT | |
| 1994-08-01 | 0.745 | DT | |
| 1993-08-01 | 0.733 | DT | |
| 1993-05-01 | 0.721 | DT | |
| 1992-08-01 | 0.683 | DT | |
| 1992-05-01 | 0.671 | DT | |
| 1991-08-01 | 0.633 | DT | |
| 1990-01-01 | 0.621 | DT | |
| 1989-08-01 | 0.573 | DT | |
| 1988-04-01 | 0.556 | DT | |
| 1987-11-01 | 0.532 | DT | |
| 1986-07-01 | 0.508 | DT | |
| 1983-01-01 | 0.484 | DT | |
| 1982-02-01 | 0.436 | DT | |
| 1981-04-01 | 0.321 | DT | |
| 1980-05-01 | 0.263 | DT | |
| 1980-02-01 | 0.23896 | DT | |
| 1979-05-01 | 0.232 | DT | |
| 1978-05-01 | 0.21425 | DT | |
| 1977-02-01 | 0.193 | DT | |
| 1975-06-01 | 0.145 | DT | |
| 1974-01-01 | 0.13 | DT | |
| 1971-05-01 | 0.104 | DT | |
| 1968-05-01 | 0.084 | DT | |
| 1966-01-01 | 0.084 | DT | |
| 1961-04-01 | 0.076 | DT | |