Year	per 1000 people
1960	1.405
1965	1.667
1970	1.863
1971	1.896
1972	1.985
1973	2.042
1974	2.102
1975	2.152
1976	2.205
1977	2.258
1978	2.321
1979	2.408
1980	2.46
1981	2.484
1982	2.588
1983	2.688
1984	2.759
1985	2.865
1986	2.953
1987	3.022
1988	3.09
1989	3.139
1990	3.17
1991	2.979
1992	3.166
1993	3.359
1994	3.327
1995	3.458
1996	3.539
1997	3.447
1998	3.449
2000	3.399
2003	3.562
2006	3.66
2007	3.665
2008	3.635
2010	3.775
2011	3.859
2012	3.916
2013	3.984
2014	3.999