Year per Person 1980 31.00813 1981 29.81616 1982 29.49031 1983 28.4087 1984 27.86654 1985 27.0799 1986 25.53531 1987 24.74043 1988 24.12817 1989 23.50601 1990 24.48242 1991 27.91469 1992 28.56843 1993 27.86224 1994 27.17622 1995 26.3022 1996 25.65578 1997 25.0253 1998 26.36921 1999 33.14923 2000 32.32967 2001 34.25236 2002 36.41349 2003 36.43775 2004 36.14267 2005 35.55799 2006 35.57909 2007 34.65499 2008 33.74904 2009 32.86275 2010 31.99732 2011 31.15282 2012 30.27999 2013 29.42658 2014 28.65428 2015 27.9076 2016 27.18031