Year	Cases per 100,000
1990	20.52
1991	20.73
1992	20.92
1993	21.07
1994	21.22
1995	21.4
1996	21.72
1997	22.24
1998	21.98
1999	21.43
2000	20.86
2001	19.85
2002	19.01
2003	18.34
2004	17.65
2005	16.97
2006	16.92
2007	16.77
2008	16.63
2009	16.48
2010	16.37
2011	16.2
2012	16.06
2013	15.91
2014	15.76
2015	15.71
2016	15.65