Year	per 1,000 people
1960	4.7907772064209
1970	3.93959999084473
1980	3.31439995765686
1990	2.5
1994	1.793900013
1995	1.7799999714
1996	1.75
1997	1.7100000381
1998	1.6799999475
2000	1.65
2001	1.61
2002	1.57
2003	1.54
2004	1.5
2005	1.35
2006	1.32
2007	1.3
2008	1.25
2009	1.24
2010	1.24
2011	1.23
2012	1.2
2013	1.18
2014	1.17
2015	1.16
2016	1.15
2017	1.14
2018	1.11
2019	1.1