Year	per person
1800	1.108
1820	1.108
1913	1.712
1950	2.068
1951	2.09
1952	1.998
1953	2.216
1954	2.429
1955	2.212
1956	2.279
1957	2.289
1958	2.189
1959	2.436
1960	2.541
1961	2.559
1962	2.61
1963	2.626
1964	2.607
1965	2.568
1966	2.497
1967	2.469
1968	2.431
1969	2.443
1970	2.625
1971	2.748
1972	2.584
1973	2.576
1974	2.682
1975	2.299
1976	2.171
1977	2.178
1978	2.323
1979	2.231
1980	2.133
1981	2.106
1982	1.921
1983	1.72
1984	1.77
1985	1.804
1986	1.823
1987	1.857
1988	1.908
1989	1.95
1990	1.96
1991	2.007
1992	2.029
1993	2.066
1994	2.074
1995	2.108
1996	2.16
1997	2.204
1998	2.259
1999	2.308
2000	2.341
2001	2.387
2002	2.439
2003	2.508
2004	2.591
2005	2.686
2006	2.788
2007	2.873
2008	3.005
2009	3.033