| Year | Protected | Not Protected | Protected % |
| 1998 | 0 | 10 | 0.00 |
| 1999 | 0 | 17 | 0.00 |
| 2000 | 16 | 5 | 76.19 |
| 2001 | 28 | 0 | 100.00 |
| 2002 | 29 | 5 | 85.29 |
| 2003 | 22 | 17 | 56.41 |
| 2004 | 0 | 40 | 0.00 |
| 2005 | 2 | 39 | 4.88 |
| 2006 | 4 | 37 | 9.76 |
| 2007 | 31 | 0 | 100.00 |
| 2008 | 10 | 21 | 32.26 |
| 2009 | 16 | 16 | 50.00 |
| 2010 | 2 | 30 | 6.25 |
| 2011 | 0 | 32 | 0.00 |
| 2012 | 0 | 33 | 0.00 |
| Totals | 160 | 302 | 34.63 |