Year	Cases per 100,000
1990	31.02
1991	30.83
1992	29.75
1993	28.3
1994	27.65
1995	27.28
1996	25.88
1997	25.36
1998	24.67
1999	24.89
2000	23.59
2001	22.71
2002	22
2003	21.61
2004	21.33
2005	20.81
2006	20.38
2007	20.07
2008	19.6
2009	19.08
2010	18.65
2011	18.05
2012	17.71
2013	17.17
2014	16.3
2015	15.86
2016	15.47