Year	Cases per 100,000
1990	30.5
1991	30.08
1992	29.82
1993	29.45
1994	28.98
1995	28.64
1996	28.59
1997	28.14
1998	27.82
1999	27.48
2000	26.98
2001	26.34
2002	25.68
2003	25.24
2004	24.59
2005	23.87
2006	23.37
2007	22.81
2008	22.23
2009	21.74
2010	21.3
2011	20.89
2012	20.51
2013	20.42
2014	20.21
2015	20.32
2016	20.64