Year	Cases per 100,000
1990	25.65
1991	25.93
1992	26.22
1993	26.51
1994	26.81
1995	27.12
1996	26.73
1997	26.37
1998	26.01
1999	25.66
2000	25.34
2001	24.66
2002	24.01
2003	23.39
2004	22.79
2005	22.23
2006	21.97
2007	21.71
2008	21.47
2009	21.23
2010	21.01
2011	20.89
2012	20.79
2013	20.69
2014	20.59
2015	20.5
2016	20.41