Year	per 1000 people
1965	0.488
1975	0.539
1978	0.551
1987	0.613
1992	0.624
1996	0.593
2004	0.731
2010	0.728
2011	0.715
2012	0.725
2013	0.742
2014	0.756
2015	0.767
2016	0.818