| | Jan 1, 2007 | Apr 30, 2007 | 119 days | 7 | 1.43 |
| | Jul 1, 2006 | Dec 31, 2006 | 183 days | 21 | 0.81 |
| | Jan 1, 2006 | Jun 30, 2006 | 180 days | 17 | 1.24 |
| | Jul 1, 2004 | Dec 31, 2005 | 548 days | 55 | 1.45 |
| | Jul 1, 2003 | Jun 30, 2004 | 365 days | 37 | 1.65 |
| | Jan 1, 2003 | Jun 30, 2003 | 180 days | 16 | 0.94 |
| | Jul 1, 2002 | Dec 31, 2002 | 183 days | 18 | 0.78 |
| | Oct 2, 2001 | Jun 30, 2002 | 271 days | 23 | 1.74 |
| | Jul 1, 2001 | Oct 1, 2001 | 92 days | 14 | 1.43 |
| | Mar 16, 2001 | Jun 30, 2001 | 106 days | 17 | 0.71 |
| | Aug 16, 2000 | Mar 15, 2001 | 211 days | 14 | 1.71 |
| | Aug 1, 2000 | Aug 15, 2000 | 14 days | 2 | 0.00 |
| | Dec 3, 1999 | Jul 31, 2000 | 241 days | 19 | 1.21 |
| | Nov 1, 1999 | Dec 1, 1999 | 30 days | 2 | 2.00 |
| | Jun 15, 1999 | Oct 24, 1999 | 131 days | 15 | 0.80 |
| | May 3, 1999 | Jun 14, 1999 | 42 days | 5 | 1.80 |
| | Oct 1, 1998 | May 2, 1999 | 213 days | 15 | 0.93 |
| | Jul 1, 1998 | Sep 30, 1998 | 91 days | 12 | 0.58 |
| | Jan 1, 1998 | Jun 30, 1998 | 180 days | 15 | 1.13 |
| | Jun 1, 1997 | Dec 31, 1997 | 213 days | 19 | 1.05 |
|
| Aug 18, 1996 | Jun 30, 1997 | 316 days | 24 | 1.21 |
| | Jan 1, 1996 | Aug 18, 1996 | 230 days | 5 | 0.20 |
| | Jul 1, 1993 | Jun 30, 1996 | 1095 days | 73 | 1.22 |
|
| Jul 1, 1992 | Jun 30, 1993 | 364 days | 5 | 1.80 |
|
| Jul 1, 1990 | Apr 30, 1992 | 669 days | 11 | 0.91 |
| | Jan 1, 1990 | Jun 30, 1990 | 180 days | 0 | - |
| | Jan 1, 1986 | Jun 30, 1986 | 180 days | 0 | - |
|
| Jan 1, 1984 | Aug 31, 1985 | 608 days | 0 | - |
| | Jan 1, 1982 | Dec 31, 1982 | 364 days | 0 | - |
|
| Jan 1, 1980 | Dec 31, 1980 | 365 days | 5 | 0.40 |
| | Jan 1, 1979 | Dec 31, 1979 | 364 days | 5 | 0.80 |
| | Jan 1, 1978 | Dec 31, 1978 | 364 days | 4 | 1.25 |
|
| Jan 1, 1977 | Jun 8, 1977 | 158 days | 12 | 1.25 |
| | Jul 1, 1971 | Dec 31, 1973 | 914 days | 2 | 0.00 |
|
| Feb 1, 1970 | Jul 31, 1970 | 180 days | 0 | - |
| | Jan 1, 1963 | Dec 31, 1963 | 364 days | 1 | 0.00 |
|
| Jan 1, 1957 | Dec 31, 1957 | 364 days | 2 | 1.50 |