Year	Cases per 100,000
1990	29.73
1991	29.88
1992	31.36
1993	31.85
1994	31.48
1995	29.46
1996	28.28
1997	26.54
1998	25.5
1999	24.97
2000	23.93
2001	23.77
2002	23.21
2003	23.4
2004	23.36
2005	23.8
2006	23.89
2007	23.49
2008	23.81
2009	23.53
2010	23.07
2011	22.62
2012	21.68
2013	20.88
2014	20.78
2015	20.84
2016	20.33