Year	per 1,000 people
1960	9.80000019073486
1970	12.8999996185303
1980	14.8000001907349
1985	15.8000001907349
1990	16.7000007629
1991	16.2999992371
1992	15.8999996185
1993	14.8000001907
1994	14.6999998093
1995	14.6000003815
2002	7.5
2006	5.3391
2007	4.12
2008	3.91
2009	3.7
2010	3.58
2011	3.29
2012	3.25
2013	3.22
2014	3.16
2015	3.12
2016	3.13
2017	3.06
2018	2.87
2019	2.83