Year	Cases per 100,000
1990	22.41
1991	21.8
1992	21.22
1993	20.66
1994	20.12
1995	19.61
1996	20.04
1997	20.5
1998	20.97
1999	21.45
2000	21.96
2001	23.06
2002	24.23
2003	25.46
2004	26.76
2005	28.13
2006	28.6
2007	29.07
2008	29.55
2009	30.05
2010	30.56
2011	31.05
2012	31.55
2013	32.07
2014	32.59
2015	33.13
2016	33.68