Year	Cases per 100,000
1990	22.01
1991	22.23
1992	22.26
1993	22.07
1994	22.16
1995	22.18
1996	22.23
1997	22.16
1998	22.06
1999	21.72
2000	21.43
2001	21.14
2002	20.87
2003	20.66
2004	20.43
2005	20.2
2006	19.94
2007	19.63
2008	19.3
2009	18.99
2010	18.79
2011	18.6
2012	18.41
2013	18.42
2014	18.4
2015	18.34
2016	18.37