Year	per 1,000 people
1960	6.79856109619141
1970	4.83470010757446
1980	4.144700050354
1989	2.98539996147156
1997	2.7599999905
2000	2.4
2001	2.3
2002	2.2
2003	2.2
2004	2.1
2005	1.9
2006	1.9
2007	1.9
2008	1.8
2009	1.8
2010	2
2011	1.85
2012	2.2
2013	2.2
2014	2.04
2015	2.04
2016	2.04
2017	2.04