Year	per 1000 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	1.058
1999	2.065
2000	2.008
2001	2.191
2002	2.372
2003	2.454
2004	2.204
2005	2.421
2006	2.482
2007	2.653
2008	2.425
2009	2.342
2010	2.487
2013	2.591
2014	2.65
2015	3.426