Year	Cases per 100,000
1990	30.51
1991	29.8
1992	29.4
1993	29.37
1994	29.07
1995	29.27
1996	28.16
1997	28.54
1998	28.36
1999	27.03
2000	26.29
2001	25.31
2002	24.83
2003	24.21
2004	23.34
2005	23.6
2006	23.31
2007	23.18
2008	22.88
2009	22.6
2010	22.14
2011	21.82
2012	21.18
2013	20.7
2014	20.32
2015	20
2016	19.7