Year	per person
1800	1.035
1820	1.035
1950	1.002
1970	1.534
1971	1.577
1972	1.577
1973	1.564
1974	1.612
1975	1.445
1976	1.415
1977	1.531
1978	1.707
1979	1.835
1980	2.113
1981	2.294
1982	2.161
1983	2.439
1984	3.004
1985	3.29
1986	3.484
1987	3.671
1988	3.864
1989	4.087
1990	4.605
1991	4.808
1992	4.96
1993	5.119
1994	5.316
1995	5.556
1996	5.913
1997	6.46
1998	6.929
1999	7.336
2000	7.53
2001	7.65
2002	7.991
2003	8.596
2004	9.423
2005	8.809
2006	10.09
2007	10.82
2008	11.49
2009	11.14