Year per Person 1985 20.88675 1986 20.75106 1987 21.05937 1988 20.5842 1989 20.41961 1990 19.41142 1991 18.12026 1992 12.55179 1993 13.26073 1994 7.06593 1995 6.25214 1996 6.68689 1997 3.23528 1998 2.45453 1999 4.15796 2000 8.4765 2001 9.15475 2002 9.45227 2003 10.33649 2004 10.09568 2005 10.79198 2006 11.29414 2007 12.09145 2008 12.04616 2009 6.538 2010 7.49291 2011 10.35821 2012 10.64175 2013 10.45697 2014 11.04927 2015 11.25154 2016 10.61572