Year	per 1,000 people
1960	3.3850837568464938
1970	3.420190700812409
1990	2.4240309500075394
1993	2.488176564229726
1996	2.1935333626333016
2000	2.384626347080044
2003	1.7501528061680027
2005	2.119290604726036
2006	1.8197576860677682
2007	1.6911210197623907
2008	1.7707418295672066
2009	1.7454451458765854
2010	1.9416268240579957
2011	1.8597709213465465
2012	1.9084294956713848
2013	1.9337327049083717
2014	1.8535098757775608
2015	1.8230679379542098
2016	1.849574308788282
2017	1.8322616928003754