Year	Cases per 100,000
1990	35.18
1991	35.05
1992	35.64
1993	36.22
1994	36.35
1995	35.87
1996	34.98
1997	33.86
1998	32.79
1999	31.8
2000	30.58
2001	29.11
2002	28.38
2003	27.81
2004	27.12
2005	26.43
2006	25.73
2007	25.27
2008	25.28
2009	25.6
2010	25.53
2011	25.1
2012	24.3
2013	23.36
2014	22.46
2015	22.07
2016	21.68