Year	Cases per 100,000
1990	16.7
1991	16.6
1992	16.62
1993	16.9
1994	17.1
1995	17.34
1996	17.88
1997	18.45
1998	18.79
1999	18.82
2000	18.92
2001	18.87
2002	18.58
2003	18.13
2004	17.72
2005	17.39
2006	17.1
2007	16.78
2008	16.43
2009	16.18
2010	15.92
2011	15.61
2012	15.55
2013	15.56
2014	15.71
2015	15.72
2016	15.75