Year	per 1,000 people
1960	0.346
1965	0.37
1970	0.404
1975	0.378
1980	0.786
1981	1.114
1982	1.128
1984	1.159
1991	1.348
1994	1.625
1997	1.66
1998	1.009
1999	1.957
2000	1.894
2001	2.058
2002	2.221
2003	2.293
2004	2.06
2005	2.273
2006	2.259
2007	2.36
2008	2.198
2009	2.164
2010	2.339
2013	2.43
2014	2.27
2015	2.741
2017	2.226
2019	2.513