Year	Cases per 100,000
1990	31.31
1991	30.53
1992	29.55
1993	28.32
1994	27.74
1995	27.38
1996	26.14
1997	25.11
1998	24.4
1999	23.88
2000	23.16
2001	22.25
2002	21.51
2003	20.78
2004	20.36
2005	19.41
2006	18.76
2007	18.61
2008	18.53
2009	19.07
2010	18.8
2011	17.96
2012	17.6
2013	17.16
2014	16.67
2015	16.34
2016	16.03