Year	Cases per 100,000
1968	51.33
1969	45.19
1970	51.85
1971	50.5055
1972	56.721
1973	53.1165
1974	60.042
1975	56.7175
1976	66.033
1977	68.4285
1978	71.884
1979	75.9195
1980	79.475
1981	85.6105
1982	88.786
1983	92.0515
1984	95.207
1985	94.8525
1986	98.418
1987	100.7235
1988	103.029
1989	100.2345
1990	98.37
1991	96.27
1992	93.83
1993	91.73
1994	90.02
1995	88.53
1996	85.23
1997	83.83
1998	82.38
1999	80.57
2000	79.21
2001	77.11
2002	75.45
2003	74.02
2004	73.1
2005	73.12
2006	72.49
2007	73.07
2008	73.2
2009	72.87
2010	72.01
2011	71.49
2012	70.84
2013	69.48
2014	68.35
2015	67.79
2016	67.37