Year	per 1000 people
1960	0.216
1965	0.185
1970	0.259
1975	0.256
1980	0.446
1981	0.463
1986	0.807
1987	0.783
1989	0.863
1990	0.835
1997	1.299
1998	1.342
1999	1.339
2000	1.37
2001	1.399
2002	1.475
2003	1.414
2004	1.465
2005	1.558
2006	0.53
2007	1.523
2008	1.528
2009	1.455
2010	1.505
2014	1.546