Year per Person 1985 0.24715 1986 0.26065 1987 0.27909 1988 0.31215 1989 0.29131 1990 0.30762 1991 0.31533 1992 0.2968 1993 0.26946 1994 0.16819 1995 0.21413 1996 0.18769 1997 0.30993 1998 0.27636 1999 0.37191 2000 0.46996 2001 0.48001 2002 0.5099 2003 0.6095 2004 0.71117 2005 0.74266 2006 0.76599 2007 0.78497 2008 0.90275 2009 0.9188 2010 0.96622 2011 0.93642 2012 0.91306 2013 0.96488 2014 0.96444 2015 0.96402 2016 0.99707