Year	Cases per 100,000
1990	21.63
1991	22.83
1992	24.08
1993	24.67
1994	25.56
1995	26.82
1996	28.22
1997	30.03
1998	29.75
1999	29.29
2000	28.51
2001	27.86
2002	27.84
2003	26.56
2004	26.01
2005	25.49
2006	25.24
2007	25.2
2008	24.73
2009	24.67
2010	24.16
2011	23.64
2012	23.64
2013	23.48
2014	23.28
2015	23.08
2016	22.87