Year	Cases per 100,000
1968	6.54
1969	6.55
1970	6.56
1971	6.37
1972	6.87
1973	5.83
1974	5.96
1975	5.29
1976	6.59
1977	6.01
1978	5.94
1979	5.47
1980	6.51
1981	6.17
1982	6.48
1983	6.68
1984	7.25
1985	7.22
1986	6.37
1987	6.62
1988	7.54
1989	7.29
1990	7.4
1991	7.46
1992	7.52
1993	7.59
1994	7.66
1995	7.73
1996	7.77
1997	7.82
1998	7.86
1999	7.91
2000	7.96
2001	7.99
2002	8.02
2003	8.05
2004	8.09
2005	8.13
2006	8.21
2007	8.28
2008	8.36
2009	8.44
2010	8.53
2011	8.56
2012	8.59
2013	8.63
2014	8.67
2015	8.71
2016	8.75