We can look and check. (The 70s throw it off a bit.) These are all 11 or 31 year periods. 1995-2005 $2.10 1965-1995 $4.84 1935-1965 $2.30 1985-2015 $2.20

We can look and check. (The 70s throw it off a bit.) These are all 11 or 31 year periods. 1995-2005 $2.10 1965-1995 $4.84 1935-1965 $2.30 1985-2015 $2.20 1980-1990 $1.59 1970-1980 $2.12 1960-1970 $1.31