Year	per 1000 people
1960	1.351
1965	1.667
1970	1.892
1975	1.869
1984	2.683
1985	2.705
1986	2.984
1988	3.032
1990	2.68
1992	2.639
1995	2.68
1998	3.002
2001	3.231
2004	3.166
2005	3.21
2010	3.21
2013	3.907