[These are obviously gross approximations: more exact figures are presented below.]
Here are some less conservative estimates, from other sources:
Based on an estimated 17% increase from 1989 to 1993 [4%/year]
Prices doubled as follows:
1982 to 1993 1973 to 1982 1950 to 1973
1993 1.17xxxx 1978 0.573016 1968 0.299207 1946 0.153972
Note fluctuations for WWI, WWII, and Depression: these come close to these doublings, but not for a permanent trend.
1916 0.090478 1915 0.075394
1898 0.047620 Was the lowest trend:
which provides for the widest possible span of 1993 1.17xxxx to 1898 0.047620