Year	per person
1800	1.102
1820	1.125
1913	2.509
1950	4.916
1973	6.248
1990	6.16
1991	5.343
1992	3.164
1993	3.017
1994	3.287
1995	3.58
1996	3.797
1997	3.928
1998	4.229
1999	4.371
2000	4.636
2001	5.106
2002	5.904
2003	6.752
2004	7.487
2005	8.559
2006	9.678
2007	10.99
2008	11.71
2009	9.92