Year	Cases per 100,000
1990	33.52
1991	31.51
1992	30.43
1993	29.12
1994	28.71
1995	28.42
1996	28.54
1997	28.75
1998	27.85
1999	26.58
2000	25.67
2001	25.01
2002	24.63
2003	24.34
2004	24.55
2005	24.32
2006	24.47
2007	24.58
2008	24.38
2009	25.37
2010	24.93
2011	25.06
2012	23.83
2013	23.36
2014	22.72
2015	22.22
2016	22.76