Year per Person 1980 19.64371 1981 24.26641 1982 22.51858 1983 20.23504 1984 18.48658 1985 18.69099 1986 19.45441 1987 19.7688 1988 20.06739 1989 15.52868 1990 14.83319 1991 14.93024 1992 15.14364 1993 14.6003 1994 13.10174 1995 15.10563 1996 12.59485 1997 13.49282 1998 16.8198 1999 56.97378 2000 72.84599 2001 82.09383 2002 84.5569 2003 79.88268 2004 75.97231 2005 74.56696 2006 71.74147 2007 67.68033 2008 66.56351 2009 25.95856 2010 25.49847 2011 25.09341 2012 27.87722 2013 25.72983 2014 23.88773 2015 23.52568 2016 23.1731