Year	per 1,000 people
1970	8.30000019073486
1980	9.39999961853027
1985	9.10000038146973
1990	8
1991	7.9000000954
1992	7.6999998093
1993	7.6999998093
1994	7.5999999046
1997	7.1999998093
1998	7.1999998093
1999	7.0999999046
2000	6.72
2001	6.62
2002	6.54
2003	6.53
2004	6.48
2005	6.44
2006	6.35
2007	6.27
2008	6.25
2009	6.15
2010	6.12
2011	6.05
2012	5.99
2013	5.93
2014	5.85
2015	5.83
2016	5.76
2017	5.66
2018	5.62
2019	5.58