Statistics are current as of October 17, 2008
| Year Filed | Number of Cases | Number of Issues | |
| 1983 | 3 | 16 | |
| 1984 | 18 | 56 | |
| 1985 | 18 | 45 | |
| 1986 | 12 | 19 | |
| 1987 | 5 | 19 | |
| 1988 | 17 | 32 | |
| 1989 | 47 | 131 | |
| 1990 | 35 | 82 | |
| 1991 | 23 | 94 | |
| 1992 | 40 | 103 | |
| 1993 | 44 | 73 | |
| 1994 | 58 | 119 | |
| 1995 | 46 | 168 | |
| 1996 | 57 | 143 | |
| 1997 | 72 | 167 | |
| 1998 | 74 | 187 | |
| 1999 | 65 | 147 | |
| 2000 | 69 | 160 | |
| 2001 | 96 | 215 | |
| 2002 | 66 | 171 | |
| 2003 | 60 | 165 | |
| 2004 | 61 | 110 | |
| 2005 | 64 | 170 | |
| 2006 | 60 | 140 | |
| 2007 | 93 | 209 | |
| 2008 | 81 | 176 |
