Year per person 1800 1.353 1820 1.382 1913 3.08 1950 6.036 1973 9.359 1990 10.75 1991 8.812 1992 6.228 1993 6.137 1994 4.237 1995 4.182 1996 3.943 1997 4.014 1998 3.758 1999 3.633 2000 3.711 2001 3.936 2002 4.24 2003 4.503 2004 4.828 2005 5.18 2006 5.444 2007 5.621 2008 6.073 2009 5.687