Year	Cases per 100,000
1953	1.02
1954	1.13
1955	0.79
1956	0.63
1957	1.56
1958	1.14
1959	0.91
1960	0.88
1961	1.05
1962	1.07
1963	0.79
1964	0.9
1965	0.65
1966	1.3
1967	0.79
1968	1.1
1969	1.38
1970	1.05
1971	1.696
1972	1.632
1973	2.208
1974	1.664
1975	2
1976	2.016
1977	1.982
1978	2.478
1979	2.834
1980	2.14
1981	2.616
1982	2.422
1983	2.338
1984	2.544
1985	2.96
1986	2.696
1987	3.302
1988	2.578
1989	3.254
1990	2.89
1991	2.89
1992	2.89
1993	2.89
1994	2.89
1995	2.9
1996	3.02
1997	3.15
1998	3.29
1999	3.44
2000	3.6
2001	3.64
2002	3.68
2003	3.73
2004	3.78
2005	3.83
2006	3.82
2007	3.8
2008	3.78
2009	3.77
2010	3.76
2011	3.74
2012	3.73
2013	3.71
2014	3.7
2015	3.69
2016	3.68