The timeplot shows the prize of Pfizer stock at the end of the month from 1940 to 2010. The stock prices range from twenty dollars to 140 dollars. The stock prices jump up sharply in 1950, 1960, and 1970, with sharp drops in the middle and slow increases to the next jump. After reaching a low point in 1980, the prices rise until 2000, when they fall sharply and continue to fall until 2010. In 2010 the prices reach their lowest point and then begin to rise slightly.
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