Year	Cases per 100,000
1990	64.85
1991	62.79
1992	61.03
1993	59.5
1994	59.7
1995	60.02
1996	59.03
1997	58.52
1998	58.61
1999	57.33
2000	56.05
2001	53.66
2002	52.08
2003	51.23
2004	50.48
2005	50.06
2006	49.81
2007	48.31
2008	47.61
2009	48.02
2010	47.69
2011	48.15
2012	49.03
2013	49.74
2014	50.41
2015	50.05
2016	50.21