Year Grams per day 1961 106.58 1962 115.33 1963 113.74 1964 120.75 1965 127.45 1966 128.86 1967 129.09 1968 132.1 1969 132 1970 130.22 1971 107.46 1972 140.69 1973 139.56 1974 175.12 1975 154.25 1976 158.28 1977 146.22 1978 138.57 1979 144.87 1980 154.55 1981 158.67 1982 135.65 1983 140.67 1984 139.86 1985 143.31 1986 145.69 1987 140.55 1988 137.55 1989 112.52 1990 111.23 1991 112.32 1992 114.18 1993 112.82 1994 116.96 1995 135.98 1996 138.36 1997 131.29 1998 129.4 1999 129.31 2000 128.83 2001 140.36 2002 135.68 2003 130.07 2004 117.43 2005 124.94 2006 119.19 2007 127.03 2008 126.18 2009 127.94 2010 123.68 2011 130.28 2012 129.36 2013 132.66