NEW YORK -- The steep decline in oil prices over the last year has forced oil companies to pull back on investments in production. The number of oil rigs operating in the U.S. has continued to drop and is now at the lowest level since 2010, according to oil services company Baker Hughes Even though brent crude oil prices have risen to roughly $65 a barrel -- a high for 2015 -- and U.S. West Texas Intermediate crude oil was just above $57, close to a six-week high, oil companies are still getting crushed.