Year	Cases per 100,000
1990	30.89
1991	32.11
1992	32.75
1993	32.08
1994	31.5
1995	31.85
1996	30.4
1997	31.03
1998	30.01
1999	29.4
2000	29.53
2001	28.29
2002	27.03
2003	25.88
2004	24.83
2005	24.17
2006	23.79
2007	23.16
2008	22.51
2009	22.14
2010	21.71
2011	20.94
2012	20.05
2013	19.11
2014	18.3
2015	17.51
2016	17.28