Year	Cases per 100,000
1958	13.62
1959	13.37
1960	17.64
1961	15.27
1962	19.05
1963	14.68
1964	19.85
1965	13.29
1966	17.43
1967	19.42
1968	18.65
1969	19.08
1970	31.91
1971	23.2595
1972	13.459
1973	24.0885
1974	28.928
1975	23.5075
1976	16.547
1977	16.7065
1978	19.766
1979	25.2655
1980	22.145
1981	17.2345
1982	23.634
1983	16.8335
1984	20.953
1985	22.0225
1986	29.112
1987	21.4915
1988	23.081
1989	26.4305
1990	28.06
1991	28.49
1992	28.93
1993	29.38
1994	29.85
1995	30.33
1996	30.09
1997	29.86
1998	29.64
1999	29.43
2000	29.23
2001	28.82
2002	28.41
2003	28.01
2004	27.63
2005	27.25
2006	26.88
2007	26.51
2008	26.15
2009	25.8
2010	25.46
2011	25.82
2012	26.2
2013	26.58
2014	26.97
2015	27.36
2016	27.77