If history was to repeat itself

In 1921, the Dow Jones Industrial Average was at a mere 64 points. By the time 1929 came around, (within 8 years), the stock market index gained almost 600% to 381 points. Have you ever wondered, that if within 8 years, leading to the year 2016, the Dow Jones 30 added 600% from the January lows near 11640? This would give us the number of 69,800. History does have a "history" of repeating itself, and this is could very well happen...