Year	Cases per 100,000
1968	62.84
1969	58.85
1970	50.13
1971	47.1395
1972	51.209
1973	50.9585
1974	54.698
1975	48.7775
1976	50.417
1977	49.1665
1978	46.086
1979	46.8555
1980	48.995
1981	44.1445
1982	46.044
1983	44.8035
1984	47.433
1985	45.9825
1986	44.862
1987	43.5715
1988	45.231
1989	47.1605
1990	43.32
1991	43.52
1992	43.13
1993	45.59
1994	46.51
1995	44.41
1996	39.12
1997	37.66
1998	38.62
1999	35.73
2000	34.36
2001	34.37
2002	33.21
2003	32.1
2004	31.94
2005	30.65
2006	31.25
2007	31.43
2008	28.66
2009	27.63
2010	25.94
2011	26
2012	26.34
2013	24.14
2014	25.14
2015	24.61
2016	24.37