Year	Cases per 100,000
1990	7.55
1991	6.93
1992	6.28
1993	5.62
1994	5.11
1995	4.74
1996	4.46
1997	4.35
1998	4.22
1999	4.2
2000	4.22
2001	4.24
2002	4.29
2003	4.38
2004	4.47
2005	4.6
2006	4.51
2007	4.46
2008	4.43
2009	4.38
2010	4.34
2011	4.3
2012	4.28
2013	4.25
2014	4.24
2015	4.22
2016	4.21