Year	per 1,000 people
1960	4.36649942398071
1970	4.63240003585815
1990	5.4211997986
1993	6
1996	5.1300001144
2003	4.9000000954
2005	4.9
2006	4.9
2007	4.9
2008	6
2009	5.9
2010	5.9
2011	5.08
2012	5.04
2013	5.05
2014	5.16
2015	5.24
2016	5.32
2017	5.33