Year	Cases per 100,000
1953	1.17
1954	1.56
1955	1.7
1956	1.1
1957	2.76
1958	1.39
1959	1
1960	1.34
1961	2.69
1962	1.2
1963	1.68
1964	1.27
1965	1.25
1966	2.14
1967	1.44
1968	1.77
1969	2.88
1970	2.13
1971	2.676
1972	3.172
1973	3.478
1974	3.944
1975	4.2
1976	4.026
1977	3.392
1978	4.468
1979	4.374
1980	4.85
1981	4.196
1982	5.012
1983	5.288
1984	5.774
1985	5.78
1986	5.726
1987	5.312
1988	5.538
1989	5.414
1990	5.51
1991	5.58
1992	5.66
1993	5.74
1994	5.82
1995	5.91
1996	6.09
1997	6.27
1998	6.47
1999	6.67
2000	6.89
2001	7.09
2002	7.31
2003	7.53
2004	7.76
2005	8.01
2006	8.06
2007	8.11
2008	8.17
2009	8.23
2010	8.29
2011	8.3
2012	8.32
2013	8.33
2014	8.35
2015	8.37
2016	8.39