Year	Cases per 100,000
1968	15.59
1969	15.63
1970	14.39
1971	15.1985
1972	16.727
1973	16.7555
1974	18.454
1975	17.8925
1976	20.751
1977	21.2995
1978	21.188
1979	22.7465
1980	22.735
1981	23.5835
1982	25.042
1983	25.5605
1984	27.019
1985	27.6775
1986	30.026
1987	31.6245
1988	33.663
1989	32.8915
1990	32.85
1991	33.4
1992	33.96
1993	34.53
1994	35.12
1995	35.72
1996	36.1
1997	36.49
1998	36.89
1999	37.29
2000	37.71
2001	38.14
2002	38.58
2003	39.03
2004	39.48
2005	39.95
2006	40.27
2007	40.59
2008	40.92
2009	41.25
2010	41.6
2011	41.69
2012	41.79
2013	41.89
2014	42
2015	42.1
2016	42.23