Year	per person
1500	1.642
1600	1.642
1700	1.642
1800	1.642
1820	1.642
1870	2.243
1913	3.117
1950	3.146
1951	3.127
1952	3.111
1953	3.092
1954	3.074
1955	3.058
1956	3.128
1957	3.199
1958	3.273
1959	3.349
1960	3.428
1961	3.564
1962	3.713
1963	3.873
1964	4.032
1965	4.195
1966	4.121
1967	3.98
1968	3.961
1969	4.153
1970	4.336
1971	4.436
1972	4.439
1973	4.475
1974	4.551
1975	4.912
1976	5.554
1977	6.109
1978	6.375
1979	6.672
1980	7.154
1981	7.175
1982	7.684
1983	8.027
1984	8.261
1985	8.542
1986	8.505
1987	8.521
1988	8.677
1989	8.737
1990	8.72
1991	8.231
1992	8.322
1993	8.277
1994	8.425
1995	8.63
1996	8.866
1997	9.152
1998	9.466
1999	9.831
2000	10.15
2001	10.3
2002	10.43
2003	10.56
2004	10.79
2005	11.07
2006	11.61
2007	12.05
2008	12.64
2009	12.97