| Year | Protected | Not Protected | Protected % |
| 1999 | 0 | 17 | 0.00 |
| 2000 | 0 | 21 | 0.00 |
| 2001 | 0 | 28 | 0.00 |
| 2002 | 1 | 33 | 2.94 |
| 2003 | 18 | 21 | 46.15 |
| 2004 | 40 | 0 | 100.00 |
| 2005 | 38 | 3 | 92.68 |
| 2006 | 27 | 14 | 65.85 |
| 2007 | 32 | -1 | 103.23 |
| 2008 | 25 | 6 | 80.65 |
| 2009 | 19 | 13 | 59.38 |
| 2010 | 2 | 30 | 6.25 |
| 2011 | 20 | 12 | 62.50 |
| 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 | 222 | 366 | 37.76 |