| Year | Protected | Not Protected | Protected % |
| 1998-99 | 2 | 6 | 25.00 |
| 1999-00 | 0 | 10 | 0.00 |
| 2000-01 | 0 | 12 | 0.00 |
| 2001-02 | 1 | 13 | 7.14 |
| 2002-03 | 3 | 12 | 20.00 |
| 2003-04 | 10 | 6 | 62.50 |
| 2004-05 | 3 | 14 | 17.65 |
| 2006-07 | 1 | 1 | 50.00 |
| 2007-08 | 2 | 0 | 100.00 |
| 2010-11 | 2 | 0 | 100.00 |
| 2011-12 | 1 | 1 | 50.00 |
| 2012-13 | 2 | 0 | 100.00 |
| 2013-14 | 0 | 2 | 0.00 |
| 2014-15 | 0 | 2 | 0.00 |
| 2015-16 | 0 | 2 | 0.00 |
| 2016-17 | 0 | 2 | 0.00 |
| 2017-18 | 0 | 2 | 0.00 |
| Totals | 27 | 85 | 24.11 |