Year	per person
1800	1.775
1820	1.775
1950	0.772
1951	0.779
1952	0.808
1953	0.7966
1954	0.8679
1955	0.8293
1956	0.9155
1957	0.9518
1958	0.9736
1959	1.041
1960	1.074
1961	1.036
1962	1.09
1963	1.14
1964	1.079
1965	1.101
1966	1.121
1967	1.148
1968	1.169
1969	1.157
1970	1.036
1971	0.9857
1972	0.9246
1973	1.245
1974	1.054
1975	0.9285
1976	1.031
1977	1.151
1978	1.301
1979	1.334
1980	1.33
1981	1.31
1982	1.369
1983	1.422
1984	1.487
1985	1.55
1986	1.588
1987	1.5
1988	1.481
1989	1.462
1990	1.41
1991	1.462
1992	1.496
1993	1.485
1994	1.492
1995	1.553
1996	1.602
1997	1.61
1998	1.6
1999	1.74
2000	1.828
2001	1.897
2002	1.965
2003	2.031
2004	2.863
2005	3.186
2006	3.446
2007	4.014
2008	4.199
2009	4.015