| Year |
N |
Mean |
25th/75th Percentile |
| Fall 2010 |
4,049 |
25.2 |
22/28 |
| Fall 2009 |
3,906 |
24.7 |
22/28 |
| Fall 2008 |
3,825 |
24.4 |
22/27 |
| Fall 2007 |
3,532 |
24.3 |
21/27 |
| Fall 2006 |
3,799 |
23.9 |
21/26 |
| Fall 2005 |
3,427 |
24.6 |
22/27 |
| Fall 2004 |
3,581 |
24.2 |
21/27 |
| Fall 2003 |
3,356 |
24.3 |
22/27 |
| Fall 2002 |
3,362 |
23.8 |
21/26 |
| Fall 2001 |
2,875 |
24.1 |
21/26 |
| Fall 2000 |
2,754 |
24.0 |
21/26 |
| Fall 1999 |
2,532 |
24.3 |
22/27 |
|