Year	per 1,000 people
1980	11.3000001907349
1985	11.3999996185303
1990	11.3000001907
1991	11.1000003815
1992	10.6999998093
1993	10.3999996185
1994	10.1999998093
2000	7.8
2001	7.77
2002	7.76
2003	7.73
2004	7.65
2005	7.57
2006	7.45
2007	7.33
2008	7.21
2009	7.14
2010	7.3
2011	7.06
2012	6.93
2013	6.7
2014	6.68
2015	6.67
2016	6.66
2017	6.63
2018	6.62