Year	Cases per 100,000
1990	18.03
1991	18.18
1992	18.29
1993	18.12
1994	17.95
1995	18.08
1996	18.23
1997	18.53
1998	18.79
1999	19.22
2000	20
2001	20.25
2002	20.9
2003	21.33
2004	21.8
2005	22.26
2006	22.65
2007	23
2008	23.2
2009	23.37
2010	23.43
2011	23.43
2012	23.45
2013	23.43
2014	23.42
2015	23.42
2016	23.43