Year	Cases per 100,000
1990	30.46
1991	29.78
1992	29.34
1993	28.35
1994	27.2
1995	26.05
1996	25.34
1997	24.67
1998	23.52
1999	22.9
2000	22.45
2001	22.34
2002	22.12
2003	22.04
2004	21.9
2005	21.36
2006	20.6
2007	19.61
2008	18.76
2009	18.09
2010	17.57
2011	17.17
2012	16.71
2013	16.43
2014	16.16
2015	16.02
2016	15.86