Year	Cases per 100,000
1990	31.02
1991	30.46
1992	29.91
1993	29.33
1994	28.72
1995	28.42
1996	27.75
1997	27.39
1998	27.13
1999	26.8
2000	26.49
2001	25.94
2002	25.49
2003	25.5
2004	24.61
2005	23.73
2006	22.46
2007	21.94
2008	21.43
2009	20.96
2010	20.66
2011	20.33
2012	19.94
2013	19.87
2014	19.83
2015	19.78
2016	19.76