Year	per 1,000 people
1960	3.3534103953996013
1970	3.403419393341976
1990	2.4397362565958254
1993	2.5336493095932284
1996	2.2562939623818874
2000	2.36498471836499
2002	1.9285163312922426
2003	1.849965089563033
2005	2.1819302344737053
2006	1.8667801760180878
2007	1.7543638270785626
2008	1.8529678345259193
2009	1.866866286932865
2010	2.0250782772657208
2011	1.9591109619707827
2012	1.9559208504610817
2013	1.98207360802363
2014	1.9628574506477987
2015	1.931777696589087
2016	1.9581013137206034
2017	1.9421031027413544