| Years | Number of Discharges in Millions, Weighted |
|---|---|
| 1988 | 35,171,448 |
| 1989 | 35,104,645 |
| 1990 | 35,215,397 |
| 1991 | 35036492 |
| 1992 | 35,011,385 |
| 1993 | 34714530 |
| 1994 | 34,622,203 |
| 1995 | 34,791,998 |
| 1996 | 34,874,386 |
| 1997 | 35,408,207 |
| 1998 | 34,874,001 |
| 1999 | 35,467,673 |
| 2000 | 36417565 |
| 2001 | 37,187,641 |
| 2002 | 37,804,021 |
| 2003 | 38,220,659 |
| 2004 | 38,661,786 |
| 2005 | 39,163,834 |
| 2006 | 39,450,216 |
| 2007 | 39,541,948 |
| 2008 | 39,885,120 |
| 2009 | 39,434,956 |
| 2010 | 39,008,298 |