Also explain how to get PE ratio for 100 years

Graph the P/E ratio for the S&P 500 for the last 100 years (annual data is fine). Comment on the current level of the P/E ratio compared to the past 100 years, especially compared to the 2000 tech stock bubble and the 2007 stock bubble prior to the financial crisis. Graph the P/E ratio for the S&P 500 for the last 100 years (annual data is fine). Comment on the current level of the P/E ratio compared to the past 100 years, especially compared to the 2000 tech stock bubble and the 2007 stock bubble prior to the financial crisis