How often is negative supply shocks associated with recessions? Plot on a quarterly basis since 1971 the

Question:

How often is negative supply shocks associated with recessions? Plot on a quarterly basis since 1971 the real price of oil measured as the ratio of the nominal price of oil (FRED code: OILPRICE) to the U.S. Consumer Price Index (CPIAUCSL). Identify recessions that may have been triggered in part by an oil price shock.