Year	Cases per 100,000
1990	20.29
1991	20.15
1992	19.96
1993	19.7
1994	19.47
1995	19.28
1996	19.12
1997	19
1998	19.19
1999	19.34
2000	19.37
2001	19.22
2002	19.45
2003	19.72
2004	19.82
2005	19.82
2006	19.94
2007	19.96
2008	20.02
2009	20.07
2010	20.23
2011	20.23
2012	20.17
2013	20.09
2014	19.99
2015	19.89
2016	19.81