| Year | Protected | Not Protected | Protected % |
| 1998 | 0 | 10 | 0.00 |
| 1999 | 6 | 11 | 35.29 |
| 2000 | 11 | 10 | 52.38 |
| 2001 | 0 | 28 | 0.00 |
| 2002 | 9 | 25 | 26.47 |
| 2003 | 0 | 39 | 0.00 |
| 2004 | 0 | 40 | 0.00 |
| 2005 | 13 | 28 | 31.71 |
| 2006 | 36 | 5 | 87.80 |
| 2007 | 32 | -1 | 103.23 |
| 2008 | 1 | 30 | 3.23 |
| 2009 | 1 | 31 | 3.13 |
| 2010 | 32 | 0 | 100.00 |
| 2011 | 31 | 1 | 96.88 |
| 2012 | 20 | 13 | 60.61 |
| 2013 | 0 | 33 | 0.00 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| Totals | 192 | 371 | 34.10 |