143.59 to 1814.16 from 1981 to 2014 is 33 years to grow 13 fold. 13 fold is a double 3.6 times (1-2-4-8-13) 3.6 doubles in 33 years is a double every 9 years. 9 years to double is 8% per year using the Rule of 72. (Instead of using a financial calculator)
No dividends are considered in this calculation, which are substantial over time (after tax, reinvested).