| Year | Protected | Not Protected | Protected % |
| 1999 | 0 | 17 | 0.00 |
| 2000 | 3 | 18 | 14.29 |
| 2001 | 21 | 7 | 75.00 |
| 2002 | 22 | 12 | 64.71 |
| 2003 | 10 | 29 | 25.64 |
| 2004 | 32 | 8 | 80.00 |
| 2005 | 36 | 5 | 87.80 |
| 2006 | 34 | 7 | 82.93 |
| 2007 | 31 | 0 | 100.00 |
| 2008 | 31 | 0 | 100.00 |
| 2009 | 32 | 0 | 100.00 |
| 2010 | 25 | 7 | 78.13 |
| 2011 | 5 | 27 | 15.63 |
| 2012 | 2 | 31 | 6.06 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| Totals | 284 | 269 | 51.36 |