Year per Person 1970 0.00324 1971 0.00411 1972 0.0052 1973 0.00628 1974 0.00775 1975 0.00894 1976 0.01002 1977 0.01184 1978 0.01322 1979 0.01377 1980 0.01335 1981 0.01175 1982 0.01085 1983 0.01095 1984 0.01097 1985 0.01123 1986 0.01173 1987 0.01162 1988 0.0117 1989 0.01213 1990 0.01213 1991 0.01211 1992 0.01219 1993 0.01281 1994 0.01328 1995 0.01346 1996 0.01496 1997 0.01677 1998 0.01708 1999 0.01837 2000 0.01973 2001 0.02187 2002 0.02341 2003 0.02495 2004 0.02938 2005 0.03474 2006 0.04101 2007 0.04822 2008 0.05561 2009 0.05871 2010 0.06559 2011 0.07172 2012 0.07319 2013 0.07953 2014 0.0852 2015 0.08769 2016 0.08874