Year	Cases per 100,000
1990	27.78
1991	28.11
1992	28.47
1993	28.85
1994	29.22
1995	29.64
1996	29.22
1997	28.83
1998	28.46
1999	28.1
2000	27.76
2001	26.98
2002	26.25
2003	25.54
2004	24.86
2005	24.22
2006	23.88
2007	23.52
2008	23.19
2009	22.86
2010	22.57
2011	22.37
2012	22.2
2013	22.03
2014	21.86
2015	21.69
2016	21.55