Year	Cases per 100,000
1990	24.11
1991	23.82
1992	23.63
1993	23.79
1994	23.74
1995	23.85
1996	24.07
1997	24.29
1998	24.44
1999	24.58
2000	24.77
2001	24.73
2002	24.65
2003	24.56
2004	24.45
2005	24.23
2006	24.1
2007	23.76
2008	23.57
2009	23.29
2010	23
2011	22.7
2012	22.36
2013	22.04
2014	21.75
2015	21.46
2016	21.18