Year	Cases per 100,000
1990	30.78
1991	30.41
1992	29.85
1993	29.39
1994	28.87
1995	28.41
1996	27.83
1997	27.35
1998	26.79
1999	26.42
2000	26.04
2001	25.58
2002	25.15
2003	24.7
2004	24.32
2005	23.95
2006	23.63
2007	23.3
2008	22.96
2009	22.66
2010	22.29
2011	21.81
2012	22.55
2013	22.19
2014	21.95
2015	21.77
2016	21.59