Year	per 1,000 people
1960	1.5984001159668
1970	1.47420001029968
1975	1.42859995365143
1981	1.22819995880127
1985	1.26689994335175
1990	1.2899999619
1994	1.1123000383
1997	0.9800000191
2000	1.1
2001	0.87
2002	1.09
2003	0.78
2004	0.87
2005	0.87
2006	0.87
2007	0.87
2008	1.1
2009	1.13
2010	1.13
2011	0.85
2012	0.85
2013	0.85
2014	1.1
2015	1.1
2016	1.1
2017	1