| Jahr | Bestand | Ausleihe |
| 1990 | 15727 | 42682 |
| 1991 | 16962 | 64069 |
| 1992 | 18138 | 71315 |
| 1993 | 18616 | 74911 |
| 1994 | 18615 | 70262 |
| 1995 | 19088 | 69776 |
| 1996 | 19086 | 67215 |
| 1997 | 20318 | 69452 |
| 1998 | 20239 | 69223 |
| 1999 | 20877 | 68803 |
| 2000 | 20404 | 67933 |
| 2001 | 20133 | 65527 |
| 2002 | 19837 | 73557 |
| 2003 | 20519 | 85965 |
| 2004 | 23756 | 95917 |
| 2005 | 25517 | 96026 |
| 2006 | 26332 | 99929 |
| 2007 | 24425 | 106245 |
| 2008 | 25865 | 108001 |
| 2009 | 26283 | 107723 |
| 2010 | 27276 | 111154 |
| 2011 | 28008 | 111884 |
