| Year | Protected | Not Protected | Protected % |
| 2006 | 78 | -42 | 216.67 |
| 2004 | 74 | -30 | 168.18 |
| 2009 | 9 | 25 | 26.47 |
| 2007 | 65 | -32 | 196.97 |
| 2013 | 0 | 34 | 0.00 |
| 2008 | 40 | -6 | 117.65 |
| 1998 | 1 | 14 | 6.67 |
| 2012 | 1 | 33 | 2.94 |
| 2001 | 2 | 31 | 6.06 |
| 2011 | 1 | 33 | 2.94 |
| 2003 | 60 | -18 | 142.86 |
| 2010 | 13 | 20 | 39.39 |
| 2002 | 63 | -25 | 165.79 |
| 2000 | 4 | 24 | 14.29 |
| 2005 | 86 | -41 | 191.11 |
| 1999 | 0 | 22 | 0.00 |
| Totals | 497 | 42 | 92.21 |