Year	Cases per 100,000
1990	25.11
1991	25.48
1992	25.86
1993	26.26
1994	26.66
1995	27.08
1996	26.86
1997	26.65
1998	26.46
1999	26.26
2000	26.09
2001	25.53
2002	25.01
2003	24.5
2004	24
2005	23.54
2006	23.32
2007	23.08
2008	22.87
2009	22.66
2010	22.46
2011	22.28
2012	22.11
2013	21.95
2014	21.78
2015	21.62
2016	21.48