Year	Cases per 100,000
1990	17.2
1991	17.59
1992	18
1993	18.41
1994	18.84
1995	19.29
1996	19.77
1997	20.26
1998	20.78
1999	21.3
2000	21.85
2001	22.02
2002	22.2
2003	22.38
2004	22.57
2005	22.76
2006	22.82
2007	22.87
2008	22.93
2009	23
2010	23.08
2011	22.95
2012	22.82
2013	22.7
2014	22.58
2015	22.46
2016	22.34