| Year | Protected | Not Protected | Protected % |
| 1998-99 | 6 | 2 | 75.00 |
| 1999-00 | 10 | 0 | 100.00 |
| 2000-01 | 10 | 2 | 83.33 |
| 2001-02 | 12 | 2 | 85.71 |
| 2002-03 | 13 | 2 | 86.67 |
| 2003-04 | 15 | 1 | 93.75 |
| 2004-05 | 12 | 5 | 70.59 |
| 2006-07 | 1 | 1 | 50.00 |
| 2007-08 | 2 | 0 | 100.00 |
| 2010-11 | 1 | 1 | 50.00 |
| 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 | 82 | 26 | 75.93 |