Year	per 1,000 people
1960	2.15823602676392
1970	2.28029990196228
1975	2.41190004348755
1985	2.40599989891052
1989	1.82690000534058
1990	1.8213000298
1993	1.7999999523
1996	1.4800000191
2003	0.8999999762
2004	0.9
2005	0.9
2006	1
2007	0.9
2008	0.9
2010	0.8
2011	1.14
2012	0.96
2013	0.95
2014	0.93
2015	0.93
2016	0.93
2017	0.93