U.S. Crude Oil Production

Wow. Just when I thought I couldn't have a lower opinion of government, I find data for this:
U.S. crude oil production has been plummeting since 1970. Why? What has been done about it? Tell me our oil troubles are "Bush's Fault." How many Presidents and Congresses have we had since 1970?

Ann says: It's also remarkable that this takes place after the 1970's oil embargo by OPEC. Just when we were given a vivid demonstration of the power of OPEC to slam our country, we decided, year-after-year, to strengthen their power.

It really makes no sense whatsoever.