Year per Person 1980 0.65752 1981 0.64518 1982 0.78144 1983 0.78279 1984 0.78558 1985 0.75717 1986 0.73767 1987 0.748 1988 0.75685 1989 0.82443 1990 0.79227 1991 0.78331 1992 1.08037 1993 1.27636 1994 1.2633 1995 1.25215 1996 0.87064 1997 0.85692 1998 1.00279 1999 0.99653 2000 0.99048 2001 0.98517 2002 0.90787 2003 0.95102 2004 1.02479 2005 1.07969 2006 1.17767 2007 1.5686 2008 1.86009 2009 1.95714 2010 1.86393 2011 1.97608 2012 2.10648 2013 2.25144 2014 2.37361 2015 3.09028 2016 3.4411