| Year | Protected | Not Protected | Protected % |
| 1998 | 0 | 10 | 0.00 |
| 1999 | 0 | 17 | 0.00 |
| 2000 | 0 | 21 | 0.00 |
| 2001 | 23 | 5 | 82.14 |
| 2002 | 34 | 0 | 100.00 |
| 2003 | 33 | 6 | 84.62 |
| 2004 | 40 | 0 | 100.00 |
| 2005 | 25 | 16 | 60.98 |
| 2006 | 13 | 28 | 31.71 |
| 2007 | 4 | 27 | 12.90 |
| 2008 | 13 | 18 | 41.94 |
| 2009 | 7 | 25 | 21.88 |
| 2010 | 22 | 10 | 68.75 |
| 2011 | 0 | 32 | 0.00 |
| 2012 | 0 | 33 | 0.00 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| Totals | 214 | 315 | 40.45 |