Year	Cases per 100,000
1990	20.63
1991	21.03
1992	21.45
1993	21.88
1994	22.34
1995	22.83
1996	24.35
1997	26.04
1998	27.91
1999	29.99
2000	32.34
2001	32.81
2002	33.29
2003	33.79
2004	34.29
2005	34.81
2006	34.17
2007	33.55
2008	32.95
2009	32.37
2010	31.82
2011	32.61
2012	33.43
2013	34.28
2014	35.16
2015	36.07
2016	37.03