* View data graphically
| Year | Total | Federal | Permit |
| 1976 | 110 | 83 | 27 |
| 1977 | 99 | 62 | 37 |
| 1978 | 88 | 58 | 30 |
| 1979 | 86 | 60 | 26 |
| 1980 | 80 | 52 | 28 |
| 1981 | 83 | 47 | 36 |
| 1982 | 102 | 52 | 50 |
| 1983 | 95 | 49 | 46 |
| 1984 | 103 | 50 | 53 |
| 1985 | 106 | 56 | 50 |
| 1986 | 97 | 50 | 47 |
| 1987 | 93 | 56 | 37 |
| 1988 | 75 | 44 | 31 |
| 1989 | 85 | 51 | 34 |
| 1990 | 88 | 51 | 37 |
| 1991 | 85 | 43 | 42 |
| 1992 | 69 | 34 | 35 |
| 1993 | 64 | 41 | 23 |
| 1994 | 63 | 43 | 20 |
| 1995 | 69 | 51 | 18 |
| 1996 | 47 | 36 | 11 |
| 1997 | 66 | 48 | 18 |
| 1998 | 65 | 47 | 18 |
| 1999 | 79 | 51 | 28 |
| 2000 | 72 | 48 | 24 |
| 2001 | 75 | 52 | 23 |
| 2002 | 84 | 54 | 30 |
| 2003 | 75 | 56 | 19 |
| 2004 | 66 | 48 | 18 |
| 2005 | 69 | 44 | 25 |
| 2006 | 63 | 45 | 18 |
| 2007 | 61 | 45 | 16 |
| 2008 | 55 | 43 | 12 |
| 2009 | 63 | 45 | 18 |
| 2010 | 54 | 38 | 16 |