Year	Cases per 100,000
1990	34.09
1991	34.61
1992	33.84
1993	33.3
1994	32.85
1995	32.09
1996	31.85
1997	31.36
1998	30.79
1999	30.18
2000	29.5
2001	29.23
2002	28.6
2003	28.3
2004	27.65
2005	27.14
2006	26.79
2007	26.65
2008	25.77
2009	25.43
2010	25.37
2011	25.28
2012	25.14
2013	24.71
2014	24.15
2015	23.98
2016	23.81