Year	Cases per 100,000
1990	23.47
1991	22.83
1992	21.55
1993	20.79
1994	19.53
1995	17.83
1996	17.09
1997	16.85
1998	17.63
1999	17.67
2000	17.85
2001	17.47
2002	18.83
2003	20.33
2004	21.21
2005	22.4
2006	23.06
2007	23.12
2008	23.29
2009	23.6
2010	23.72
2011	23.99
2012	23.86
2013	23.32
2014	22.8
2015	22.21
2016	21.7