Year	Cases per 100,000
1990	27.16
1991	27.32
1992	26.97
1993	27.11
1994	26.89
1995	26.4
1996	25.42
1997	24.82
1998	23.62
1999	23.62
2000	21.75
2001	20.91
2002	19.83
2003	19.61
2004	18.71
2005	18.2
2006	17.51
2007	16.21
2008	15.2
2009	16.2
2010	16.06
2011	15.89
2012	15.29
2013	15.4
2014	14.97
2015	14.66
2016	14.49