Year	per 1,000 people
1960	4.54394674301147
1970	4.4443998336792
1990	3
1993	2.5938999653
1995	3.6
1996	2.6500000954
2000	3.8
2001	3.5
2002	3.9000000954
2003	3.9
2004	3.9
2005	3.9
2007	4
2008	3.8
2009	3.8
2010	3.8
2011	3.8
2012	3.8