The seeming lockstep price of Crude Oil and the Morgan Stanley Capital International

The seeming lockstep price of Crude Oil and the Morgan Stanley Capital International EAFE based TSP 401k.A friend of mine at work got into the I fund (based on the Morgan Stanley Capital International EAFE) at the right time and rode it to some great profits. He said that as oil prices rose so did the I fund. Being a curious fellow I decided to take a look and an interesting pattern appeared.I