Year	per 1,000 people
1960	4.82499980926514
1970	4.98859977722168
1990	4.6999998093
1993	5.0152997971
1996	1.8500000238
2001	4.7
2002	4.5
2003	4.5
2004	4.5
2005	4.5
2007	3
2010	2.6
2011	2.52
2012	2.41
2013	2.41
2014	2.4