Year	Cases per 100,000
1990	29.65
1991	28.51
1992	27.6
1993	26.77
1994	27.15
1995	29
1996	28.67
1997	28.57
1998	28.34
1999	27.4
2000	26.55
2001	26.14
2002	26.14
2003	25.9
2004	24.21
2005	23.99
2006	22.82
2007	22.15
2008	21.7
2009	21.46
2010	21.02
2011	21.02
2012	20.67
2013	20.84
2014	20.81
2015	20.76
2016	20.95