| Year | Number of Items |
| P Numbers | 459 |
| 1979 | 1 |
| 1983 | 2 |
| 1989 | 51 |
| 1990 | 6 |
| 1991 | 282 |
| 1992 | 264 |
| 1993 | 1,096 |
| 1994 | 448 |
| 1995 | 423 |
| 1996 | 655 |
| 1997 | 304 |
| 1998 | 225 |
| 1999 | 298 |
| 2000 | 268 |
| 2001 | 209 |
| 2002 | 223 |
| 2003 | 93 |
| 2004 | 90 |
| 2005 | 90 |
| 2006 | 88 |
| 2007 | 52 |
| 2008 | 35 |
| 2009 | 150 |
| 2010 | 225 |
| 2011 | 99 |
| 2012 | 15 |
| Total | 6,151 |
Cataloging is an ongoing project and all numbers are subject to change.