Year	Cases per 100,000
1990	32.02
1991	31.74
1992	31.59
1993	31.77
1994	31.97
1995	31.93
1996	31.86
1997	31.68
1998	31.51
1999	31.34
2000	31.08
2001	30.48
2002	29.92
2003	29.21
2004	28.55
2005	27.75
2006	27.02
2007	26.37
2008	25.68
2009	25.17
2010	24.82
2011	24.37
2012	23.87
2013	23.48
2014	23.13
2015	22.78
2016	22.44