2. The S&P 500 is the most commonly followed equity indices and regarded as a gauge of the large cap U.S. equities market. The index includes 500 leading companies in leading industries of the U.S. economy, which are publicly held on either the NYSE or NASDAQ, and covers 75% of U.S. equities. The data file "SP500Annual.jmp" contains the annual average value of S&P 500 from 1980 to 2012. Your task is to measure the annual percentage increase of S&P 500 by fitting an exponential model