Year	Cases per 100,000
1968	14.5
1969	13.31
1970	14.63
1971	15.0635
1972	14.807
1973	15.4405
1974	17.484
1975	19.5475
1976	19.301
1977	21.8145
1978	20.008
1979	22.4115
1980	23.345
1981	28.1485
1982	29.002
1983	30.2955
1984	32.499
1985	32.2725
1986	33.936
1987	36.0695
1988	36.733
1989	38.4165
1990	40.23
1991	40.86
1992	41.5
1993	42.17
1994	42.85
1995	43.54
1996	44.47
1997	45.44
1998	46.42
1999	47.44
2000	48.49
2001	49.97
2002	51.52
2003	53.12
2004	54.79
2005	56.53
2006	58.04
2007	59.58
2008	61.19
2009	62.85
2010	64.59
2011	65.24
2012	65.92
2013	66.62
2014	67.33
2015	68.06
2016	68.85