| Year | Protected | Not Protected | Protected % |
| 1999 | 0 | 17 | 0.00 |
| 2000 | 15 | 6 | 71.43 |
| 2001 | 27 | 1 | 96.43 |
| 2002 | 34 | 0 | 100.00 |
| 2003 | 34 | 5 | 87.18 |
| 2004 | 15 | 25 | 37.50 |
| 2005 | 23 | 18 | 56.10 |
| 2006 | 29 | 12 | 70.73 |
| 2007 | 9 | 22 | 29.03 |
| 2008 | 0 | 31 | 0.00 |
| 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 |
| 2015 | 0 | 34 | 0.00 |
| 2016 | 0 | 35 | 0.00 |
| Totals | 186 | 402 | 31.63 |