Year	Cases per 100,000
1990	26.72
1991	26.21
1992	25.71
1993	25.39
1994	24.91
1995	24.25
1996	23.74
1997	23.21
1998	22.72
1999	22.47
2000	22
2001	21.62
2002	21.24
2003	20.97
2004	20.7
2005	20.51
2006	20.15
2007	19.95
2008	19.66
2009	19.33
2010	18.89
2011	18.38
2012	18.13
2013	17.72
2014	17.32
2015	17.31
2016	17.31