year  bites
1972  4
1973  3
1974  4
1975  5
1976  2
1977  14
1978  7
1979  2
1980  5
1981  10
1982  7
1983  9
1984  9
1985  7
1986  23
1987  13
1988  18
1989  13
1990  17
1991  20
1992  15 
1993  19
1994  20
1995  22
1996  13
1997  8 
1998  9
1999  16
2000  23
2001  25
2002  17
2003  12
2004  13
2005  15
2006  18
2007  18