Year	Cases per 100,000
1990	3.95
1991	3.98
1992	4.02
1993	4.06
1994	4.11
1995	4.15
1996	4.15
1997	4.14
1998	4.14
1999	4.14
2000	4.14
2001	4.17
2002	4.21
2003	4.24
2004	4.28
2005	4.32
2006	4.34
2007	4.35
2008	4.37
2009	4.4
2010	4.42
2011	4.39
2012	4.37
2013	4.34
2014	4.31
2015	4.29
2016	4.27