Year	per 1,000 people
1960	4.71140956878662
1970	4.34289979934692
1980	3.31439995765686
1989	3.33949995040894
1997	2.9000000954
2000	2.75
2001	2.82
2002	2.86
2003	2.81
2004	2.81
2005	2.81
2006	2.74
2007	2.74
2008	1.97
2009	1.9
2010	1.77
2011	1.7
2012	2.08
2013	2.08
2014	2.03
2015	1.95
2016	1.89
2017	1.74