| Year | Protected | Not Protected | Protected % |
| 1998-99 | 5 | 3 | 62.50 |
| 1999-00 | 9 | 1 | 90.00 |
| 2000-01 | 3 | 9 | 25.00 |
| 2001-02 | 4 | 10 | 28.57 |
| 2002-03 | 4 | 11 | 26.67 |
| 2003-04 | 5 | 11 | 31.25 |
| 2004-05 | 1 | 16 | 5.88 |
| 2006-07 | 0 | 2 | 0.00 |
| 2007-08 | 0 | 2 | 0.00 |
| 2010-11 | 0 | 2 | 0.00 |
| 2011-12 | 0 | 2 | 0.00 |
| 2012-13 | 0 | 2 | 0.00 |
| 2013-14 | 0 | 2 | 0.00 |
| 2014-15 | 0 | 2 | 0.00 |
| 2015-16 | 0 | 2 | 0.00 |
| Totals | 31 | 77 | 28.70 |