Year	per 1,000 people
1960	8.929438968896822
1965	8.80000019073486
1970	7.81522254812914
1971	7.5
1972	7.400000095367429
1973	7.19999980926514
1974	7.099999904632571
1975	6.80000019073486
1976	6.6291319520311625
1977	6.448625632367447
1978	6.268036196275137
1979	6.167966375852348
1980	6.077907707601301
1981	5.997606425627602
1982	5.98803330382625
1983	5.897880274915484
1984	5.807743935301268
1985	5.627365698970191
1986	5.5274460487341255
1987	5.337775540446155
1988	5.238259129356737
1989	5.129370179917629
1990	5.0098403270518945
1991	4.899770945940884
1992	4.689629462647687
1993	4.589452368807381
1994	4.3000001907
1995	4.1892212827297515
1996	3.9697892787830016
1997	3.8593052082745056
1998	3.7492717056806804
1999	3.629473643280641
2000	3.517463817980622
2001	3.4915974942356525
2002	3.41457737728434
2003	3.346718606939763
2004	3.2777031243107553
2005	3.1901626806774273
2006	3.1642532905880465
2007	3.122281821404856
2008	3.1024040773144193
2009	3.0523373233988167
2010	3.023257472085158
2011	2.9531243583140143
2012	2.9160585198546847
2013	2.8730160258243203
2014	2.8139764732612433
2015	2.7819696255248223
2016	2.752908868002438
2017	2.835644312238066