| Year | Rank | Number |
| 2011 | 1303 | 179 |
| 2010 | 1171 | 207 |
| 2009 | 1356 | 174 |
| 2008 | 1114 | 231 |
| 2007 | 1168 | 217 |
| 2006 | 1152 | 212 |
| 2005 | 1250 | 181 |
| 2004 | 1260 | 171 |
| 2003 | 1084 | 203 |
| 2002 | 1123 | 185 |
| 2001 | 1102 | 192 |
| 2000 | 1116 | 183 |
| 1999 | 1016 | 201 |
| 1998 | 1052 | 187 |
| 1997 | 1031 | 186 |
| 1996 | 1350 | 125 |
| 1995 | 1613 | 92 |
| 1994 | 1574 | 97 |
| 1993 | 3010 | 39 |
| 1992 | 4115 | 25 |
| 1991 | 6708 | 13 |
| 1990 | 8690 | 9 |