Year	per person
1800	0.9521
1820	0.9521
1913	1.471
1950	3.034
1951	3.1
1952	3.164
1953	3.228
1954	3.292
1955	3.358
1956	3.421
1957	3.485
1958	3.549
1959	3.611
1960	3.591
1961	3.594
1962	3.604
1963	3.497
1964	3.562
1965	3.472
1966	3.469
1967	3.583
1968	3.745
1969	3.802
1970	3.913
1971	3.975
1972	3.835
1973	3.649
1974	3.636
1975	3.594
1976	3.393
1977	3.386
1978	3.213
1979	3.434
1980	3.367
1981	2.993
1982	2.857
1983	2.801
1984	2.623
1985	2.607
1986	2.552
1987	2.534
1988	2.501
1989	2.528
1990	2.551
1991	2.322
1992	2.282
1993	2.263
1994	2.197
1995	2.169
1996	2.149
1997	2.163
1998	2.18
1999	2.215
2000	2.252
2001	2.316
2002	1.962
2003	2.09
2004	2.135
2005	2.167
2006	2.214
2007	2.29
2008	2.387
2009	2.208