Year Grams per day 1961 69.63 1962 67.6 1963 68.74 1964 67.13 1965 71.53 1966 68.73 1967 71.29 1968 71.24 1969 82.8 1970 74.98 1971 76.73 1972 77.84 1973 85.12 1974 82.92 1975 81.68 1976 85.52 1977 87.75 1978 92.77 1979 91.87 1980 91.25 1981 93.07 1982 81.24 1983 86.55 1984 84.93 1985 83.45 1986 83.21 1987 80.96 1988 95.15 1989 98.44 1990 107.97 1991 96.81 1992 100.4 1993 105.91 1994 106.3 1995 108 1996 109.66 1997 109.65 1998 112.25 1999 111.45 2000 108.8 2001 108.58 2002 107.62 2003 114.91 2004 113.74 2005 116.36 2006 123.89 2007 126.26 2008 125.65 2009 127.59 2010 127.24 2011 124.47 2012 129.88 2013 131.36