Year	Cases per 100,000
1983	15.75
1984	19.14
1985	17.87
1986	18.99
1987	20.93
1988	22.65
1989	23.53
1990	23.11
1991	23.5
1992	23.89
1993	24.37
1994	25.17
1995	25.73
1996	26.17
1997	26.42
1998	26.39
1999	26.8
2000	27.29
2001	28.04
2002	28.59
2003	28.96
2004	29.23
2005	29.29
2006	29.04
2007	28.74
2008	29.31
2009	29.49
2010	29.67
2011	29.9
2012	30.21
2013	30.85
2014	30.97
2015	31.09
2016	31.18