Year	Cases per 100,000
1953	0.64
1954	0.72
1955	0.77
1956	0.55
1957	1.01
1958	0.76
1959	0.85
1960	1
1961	1.24
1962	0.9
1963	0.78
1964	1.02
1965	0.76
1966	1.12
1967	1.7
1968	1.33
1969	0.85
1970	1.54
1971	2.239
1972	2.118
1973	1.607
1974	1.826
1975	2.315
1976	1.894
1977	1.693
1978	2.092
1979	1.691
1980	2.03
1981	1.899
1982	2.688
1983	2.167
1984	2.516
1985	2.955
1986	2.534
1987	2.423
1988	2.252
1989	1.911
1990	2.35
1991	2.4
1992	2.45
1993	2.51
1994	2.56
1995	2.62
1996	2.71
1997	2.81
1998	2.92
1999	3.03
2000	3.14
2001	3.23
2002	3.31
2003	3.4
2004	3.49
2005	3.59
2006	3.71
2007	3.83
2008	3.96
2009	4.1
2010	4.24
2011	4.32
2012	4.41
2013	4.49
2014	4.58
2015	4.68
2016	4.78