Year	Cases per 100,000
1953	4.17
1954	4.04
1955	4.21
1956	4
1957	4.8
1958	3.83
1959	5.36
1960	5.22
1961	5.38
1962	5.85
1963	6.37
1964	6.19
1965	6.76
1966	8.13
1967	8
1968	8.87
1969	9.43
1970	11.02
1971	10.858
1972	11.856
1973	12.234
1974	13.892
1975	14.73
1976	17.908
1977	16.666
1978	17.654
1979	19.172
1980	20.62
1981	21.878
1982	23.816
1983	27.134
1984	26.642
1985	27.65
1986	29.798
1987	31.296
1988	32.124
1989	32.032
1990	33
1991	34
1992	34.93
1993	36.32
1994	38
1995	39.47
1996	39.77
1997	40.42
1998	40.81
1999	41.81
2000	42.61
2001	43.84
2002	44.96
2003	45.52
2004	46.61
2005	47.51
2006	47.81
2007	47.77
2008	47.96
2009	48.17
2010	48.73
2011	49.15
2012	49.01
2013	48.41
2014	47.2
2015	45.96
2016	44.96