| Year | Protected | Not Protected | Protected % |
| 2006 | 35 | 1 | 97.22 |
| 2004 | 1 | 43 | 2.27 |
| 2009 | 64 | -30 | 188.24 |
| 2007 | 33 | 0 | 100.00 |
| 2008 | 62 | -28 | 182.35 |
| 1998 | 8 | 7 | 53.33 |
| 2012 | 44 | -10 | 129.41 |
| 2001 | 26 | 7 | 78.79 |
| 2011 | 36 | -2 | 105.88 |
| 2003 | 0 | 42 | 0.00 |
| 2010 | 35 | -2 | 106.06 |
| 2002 | 18 | 20 | 47.37 |
| 2000 | 29 | -1 | 103.57 |
| 2005 | 0 | 45 | 0.00 |
| 1999 | 28 | -6 | 127.27 |
| Totals | 419 | 86 | 82.97 |