Year per Person 1980 14.40296 1981 14.39916 1982 14.40464 1983 17.22788 1984 18.11942 1985 16.0141 1986 12.49351 1987 12.31124 1988 13.8801 1989 18.94604 1990 17.33087 1991 17.63368 1992 22.44932 1993 21.84659 1994 21.41486 1995 20.63942 1996 19.52478 1997 18.92866 1998 17.65911 1999 24.01455 2000 24.26424 2001 23.68394 2002 21.60884 2003 22.7215 2004 21.98876 2005 20.25194 2006 19.83725 2007 11.35292 2008 9.00361 2009 10.42261 2010 8.42508 2011 6.93191 2012 6.09554 2013 5.90654 2014 5.56153 2015 2.68954 2016 2.04837