Year	per 1,000 people
1960	0.7399689487303615
1970	0.8321862938615412
1975	0.8482575208866512
1980	1.1397986189694727
1981	1.0146754906584976
1985	1.1030570224818363
1991	1.0596627741797846
2000	1.000880780941604
2001	0.9173459685708648
2002	0.8671983699998017
2005	0.7481854631271762
2006	0.9331902406758891
2007	0.7390046568451817
2008	0.8087794169291191
2009	0.821538008486116
2010	0.8767641102348459
2011	0.7738434498454981
2012	0.7955697345392119
2013	0.7889025291658811
2014	0.8097347459262038
2015	0.6883891617974821
2016	0.6278047787774825