Year	Cases per 100,000
1953	2.5
1954	2.37
1955	2.64
1956	2.54
1957	2.92
1958	2.44
1959	2.69
1960	2.62
1961	2.93
1962	2.76
1963	2.67
1964	3.53
1965	2.58
1966	2.91
1967	4.25
1968	3.74
1969	4.88
1970	5.24
1971	4.8705
1972	5.401
1973	5.1315
1974	5.362
1975	6.5025
1976	6.263
1977	6.5035
1978	7.494
1979	7.5445
1980	8.215
1981	9.3555
1982	9.556
1983	10.2265
1984	10.687
1985	11.3075
1986	11.958
1987	13.2685
1988	13.359
1989	14.8495
1990	15.72
1991	16.63
1992	17.5
1993	18.5
1994	19.46
1995	20.36
1996	21.45
1997	22.59
1998	23.14
1999	24.3
2000	26.09
2001	27.29
2002	28.13
2003	28.78
2004	29.6
2005	30.42
2006	31
2007	31.87
2008	32.36
2009	32.87
2010	34.41
2011	34.59
2012	34.87
2013	34.8
2014	34.27
2015	33.4
2016	32.73