Year	Cases per 100,000
1953	0.74
1954	0.6
1955	0.5
1956	0.99
1957	0.61
1958	0.67
1959	0.91
1960	1.68
1961	1.37
1962	1.66
1963	1.94
1964	2.43
1965	2.43
1966	2.96
1967	2.71
1968	2.73
1969	3
1970	2.52
1971	2.8575
1972	2.545
1973	2.4125
1974	3.36
1975	3.8675
1976	3.525
1977	3.4725
1978	4.11
1979	4.0975
1980	4.575
1981	4.2225
1982	4.7
1983	4.3775
1984	5.095
1985	5.0925
1986	5.12
1987	5.3175
1988	5.125
1989	5.2025
1990	5.11
1991	5.18
1992	5.25
1993	5.32
1994	5.39
1995	5.47
1996	5.49
1997	5.51
1998	5.54
1999	5.57
2000	5.6
2001	5.7
2002	5.81
2003	5.92
2004	6.03
2005	6.15
2006	6.23
2007	6.3
2008	6.37
2009	6.45
2010	6.53
2011	6.54
2012	6.55
2013	6.56
2014	6.57
2015	6.58
2016	6.6