Year	per 1000 people
1960	0.354
1965	0.377
1970	0.42
1977	0.478
1984	0.758
1986	0.808
1988	0.873
1990	0.98
1991	1.026
1992	1.07
1993	1.112
1994	1.14
1996	1.199
1997	1.233
1998	1.268
1999	1.3
2002	1.413
2005	1.451
2006	1.474
2007	1.497
2008	1.521
2009	1.544
2010	1.568
2011	1.669
2012	1.713
2013	1.766
2014	1.821