Year	per person
1800	1.213
1820	1.213
1913	1.64
1970	7.518
1971	7.609
1972	7.665
1973	10.27
1974	11.81
1975	11.69
1976	11.51
1977	11.48
1978	11.75
1979	11.6
1980	10.41
1981	11.05
1982	10.41
1983	10.29
1984	9.589
1985	10.87
1986	11.45
1987	11.41
1988	11.84
1989	11.66
1990	11.86
1991	12.29
1992	12.41
1993	12.94
1994	12.94
1995	12.98
1996	12.24
1997	11.49
1998	11.44
1999	11.08
2000	12.13
2001	12.16
2002	12.2
2003	12.14
2004	11.97
2005	12.08
2006	11.84
2007	11.38
2008	10.95