Year	Cases per 100,000
1968	6.17
1969	6.63
1970	4.64
1971	6.0905
1972	5.171
1973	6.4115
1974	6.132
1975	7.0425
1976	7.453
1977	7.6135
1978	7.234
1979	7.5145
1980	7.515
1981	8.0355
1982	7.296
1983	8.4965
1984	8.007
1985	9.4875
1986	9.618
1987	9.9985
1988	10.969
1989	10.7395
1990	10.49
1991	10.99
1992	11.01
1993	11.44
1994	11.47
1995	11.16
1996	10.79
1997	10.9
1998	10.88
1999	10.95
2000	11.45
2001	11.82
2002	11.87
2003	12.28
2004	12.68
2005	13.25
2006	13.26
2007	13.23
2008	13.2
2009	13.1
2010	12.86
2011	13.92
2012	14.63
2013	15.34
2014	15.54
2015	15.42
2016	15.5