Year	Cases per 100,000
1990	27.59
1991	27.68
1992	27.73
1993	27.73
1994	27.33
1995	27.39
1996	27.23
1997	27.06
1998	26.53
1999	25.83
2000	25.37
2001	24.72
2002	24.87
2003	23.93
2004	23.29
2005	22.48
2006	21.79
2007	21.17
2008	20.2
2009	19.48
2010	18.8
2011	18.06
2012	17.7
2013	17.44
2014	17.27
2015	17.33
2016	17.42