Year	Cases per 100,000
1968	20.95
1969	21.85
1970	21.2
1971	20.0665
1972	23.223
1973	24.7695
1974	29.086
1975	27.6325
1976	29.999
1977	31.7055
1978	32.622
1979	34.4785
1980	36.055
1981	38.5615
1982	41.298
1983	45.4345
1984	45.991
1985	48.5275
1986	51.494
1987	54.6905
1988	58.587
1989	58.4935
1990	56.93
1991	58.43
1992	59.97
1993	61.57
1994	63.21
1995	64.91
1996	66.53
1997	68.21
1998	69.94
1999	71.71
2000	73.55
2001	74.17
2002	74.82
2003	75.48
2004	76.15
2005	76.85
2006	77.34
2007	77.83
2008	78.33
2009	78.84
2010	79.38
2011	79.23
2012	79.09
2013	78.95
2014	78.82
2015	78.69
2016	78.59