Year	Cases per 100,000
1990	29.46
1991	29.33
1992	28.5
1993	27.45
1994	27.62
1995	28.18
1996	30.58
1997	31.22
1998	33.4
1999	35.04
2000	37.74
2001	38.89
2002	39.41
2003	40.18
2004	40.39
2005	40.41
2006	40.35
2007	39.98
2008	39.67
2009	39.33
2010	38.91
2011	38.07
2012	37.33
2013	36.65
2014	35.84
2015	34.84
2016	34.26