Year	Cases per 100,000
1990	21.32
1991	22.01
1992	22.11
1993	22.58
1994	23.64
1995	23.82
1996	23.59
1997	22.26
1998	21.34
1999	20.76
2000	19.59
2001	19.02
2002	19.7
2003	20.17
2004	21.02
2005	20.98
2006	21.46
2007	21.72
2008	21.49
2009	20.74
2010	20.2
2011	19.85
2012	19.41
2013	18.93
2014	18.47
2015	18.6
2016	18.06