Year	Cases per 100,000
1990	19.3
1991	19.73
1992	20.19
1993	20.66
1994	21.16
1995	21.68
1996	22.27
1997	22.88
1998	23.51
1999	24.17
2000	24.85
2001	25.76
2002	26.72
2003	27.73
2004	28.78
2005	29.88
2006	29.78
2007	29.69
2008	29.6
2009	29.52
2010	29.45
2011	29.24
2012	29.03
2013	28.82
2014	28.61
2015	28.41
2016	28.21