| 2012 | 2011 | 2010 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Full-Time | 4,866 | 4,534 | 3,959 | 3,177 | 2,681 | 2,838 | 2,631 | 2,595 | 2,330 | 2,303 | 2,192 |
| Part-Time | 2,989 | 2,736 | 2,514 | 2,253 | 1,984 | 2,148 | 2,057 | 2,250 | 2,099 | 2,126 | 1,929 |
| Total | 7,855 | 7,077 | 6,473 | 5,430 | 4,665 | 4,986 | 4,688 | 4,845 | 4,429 | 4,324 | 4,121 |

last updated Nov. 16, 2012