Year	Cases per 100,000
1990	23.2
1991	24.3
1992	25.51
1993	26.83
1994	28.27
1995	29.84
1996	28.31
1997	26.91
1998	25.63
1999	24.46
2000	23.39
2001	23.54
2002	23.7
2003	23.86
2004	24.03
2005	24.21
2006	23.58
2007	22.98
2008	22.42
2009	21.89
2010	21.4
2011	21.21
2012	21.03
2013	20.86
2014	20.69
2015	20.53
2016	20.38