Year	Cases per 100,000
1990	47.6
1991	46.88
1992	46.73
1993	46.05
1994	45.63
1995	43.79
1996	39.89
1997	36.2
1998	33.16
1999	30.93
2000	28.44
2001	27.55
2002	27.88
2003	27.99
2004	27.91
2005	28.12
2006	28.07
2007	27.5
2008	26.92
2009	26.71
2010	26.16
2011	25.5
2012	25.06
2013	24.58
2014	23.9
2015	23.01
2016	22.91