| Year | Protected | Not Protected | Protected % |
| 1998 | 0 | 10 | 0.00 |
| 1999 | 0 | 17 | 0.00 |
| 2000 | 11 | 10 | 52.38 |
| 2001 | 9 | 19 | 32.14 |
| 2002 | 12 | 22 | 35.29 |
| 2003 | 4 | 35 | 10.26 |
| 2004 | 34 | 6 | 85.00 |
| 2005 | 36 | 5 | 87.80 |
| 2006 | 33 | 8 | 80.49 |
| 2007 | 6 | 25 | 19.35 |
| 2008 | 2 | 29 | 6.45 |
| 2009 | 0 | 32 | 0.00 |
| 2010 | 0 | 32 | 0.00 |
| 2011 | 0 | 32 | 0.00 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| Totals | 147 | 382 | 27.79 |