| Year | Protected | Not Protected | Protected % |
| 1998 | 9 | 1 | 90.00 |
| 1999 | 17 | 0 | 100.00 |
| 2000 | 21 | 0 | 100.00 |
| 2001 | 28 | 0 | 100.00 |
| 2002 | 34 | 0 | 100.00 |
| 2003 | 38 | 1 | 97.44 |
| 2004 | 40 | 0 | 100.00 |
| 2005 | 41 | 0 | 100.00 |
| 2006 | 36 | 5 | 87.80 |
| 2007 | 31 | 0 | 100.00 |
| 2008 | 24 | 7 | 77.42 |
| 2009 | 27 | 5 | 84.38 |
| 2010 | 28 | 4 | 87.50 |
| 2011 | 27 | 5 | 84.38 |
| 2012 | 14 | 19 | 42.42 |
| 2013 | 2 | 31 | 6.06 |
| 2014 | 0 | 34 | 0.00 |
| 2015 | 0 | 34 | 0.00 |
| 2016 | 0 | 35 | 0.00 |
| Totals | 417 | 181 | 69.73 |