Year	Cases per 100,000
1958	15.13
1959	13.9
1960	13
1961	12.9
1962	13.16
1963	13.31
1964	13.1
1965	11.94
1966	11.6
1967	11.82
1968	11.64
1969	10.86
1970	10.31
1971	10.562
1972	9.994
1973	9.906
1974	9.838
1975	9.91
1976	9.332
1977	9.264
1978	9.876
1979	8.988
1980	9.04
1981	9.082
1982	9.134
1983	9.306
1984	9.428
1985	9.04
1986	9.432
1987	8.474
1988	9.096
1989	8.998
1990	9
1991	8.58
1992	8.32
1993	8.1
1994	7.84
1995	7.66
1996	7.48
1997	7.17
1998	6.84
1999	6.77
2000	6.66
2001	6.46
2002	6.28
2003	6.12
2004	6.06
2005	5.78
2006	5.57
2007	5.47
2008	5.33
2009	5.2
2010	5.05
2011	5.05
2012	5.1
2013	5.05
2014	4.94
2015	4.86
2016	4.83