Year	Cases per 100,000
1953	0.28
1954	0.28
1955	0.57
1956	0.42
1957	0.43
1958	0.52
1959	0.37
1960	0.46
1961	0.65
1962	0.55
1963	0.89
1964	0.46
1965	0.3
1966	0.4
1967	0.45
1968	0.92
1969	0.52
1970	0.75
1971	0.946
1972	1.152
1973	0.778
1974	0.914
1975	0.62
1976	0.836
1977	0.862
1978	0.918
1979	0.994
1980	1.1
1981	1.106
1982	1.052
1983	0.928
1984	1.234
1985	1.44
1986	1.166
1987	0.802
1988	0.958
1989	1.134
1990	1.24
1991	1.24
1992	1.24
1993	1.23
1994	1.23
1995	1.23
1996	1.26
1997	1.29
1998	1.32
1999	1.36
2000	1.39
2001	1.44
2002	1.5
2003	1.55
2004	1.61
2005	1.67
2006	1.73
2007	1.8
2008	1.87
2009	1.94
2010	2.02
2011	2.03
2012	2.05
2013	2.07
2014	2.09
2015	2.11
2016	2.13