Year	Cases per 100,000
1990	4.42
1991	5.51
1992	6.88
1993	8.6
1994	10.75
1995	13.47
1996	15.02
1997	16.75
1998	18.69
1999	20.86
2000	23.29
2001	20.82
2002	18.61
2003	16.65
2004	14.89
2005	13.32
2006	14.14
2007	15
2008	15.92
2009	16.89
2010	17.94
2011	17.88
2012	17.82
2013	17.77
2014	17.72
2015	17.67
2016	17.64