Year	per person
1800	1.109
1820	1.109
1913	1.5
1970	11.1
1971	10.61
1972	11.66
1973	13.84
1974	19.73
1975	20.37
1976	14.59
1977	13.59
1978	13.4
1979	11.55
1980	6.257
1981	5.885
1982	6.314
1983	5.546
1984	5.813
1985	5.39
1986	5.314
1987	4.999
1988	5.742
1989	5.114
1990	5.107
1991	5.33
1992	5.278
1993	5.487
1994	5.833
1995	5.436
1996	6.042
1997	6.467
1998	7.359
1999	7.821
2000	7.679
2001	7.654
2002	7.914
2003	7.683
2004	7.417
2005	7.406
2006	7.398
2007	7.282
2008	7.061
2009	7.012