Sharply reduced activity in Oklahoma's oil patch has slowed Oklahoma's economy, which was the worst performer among all states in the second quarter, according to figures issued Thursday by the federal government.

In terms of Oklahoma's economy, the sky is not falling, but it's getting pretty dark.

Oklahoma's economy shrank in the second quarter, ranking dead last among all states, according to data issued Thursday by the Bureau of Economic Analysis.

Energy losses triggered by persistently low oil prices accounted for more than a 4 percentage point reduction in Oklahoma's gross domestic product, a measure of the output of the state's goods and services, the agency said.

Oklahoma was one of only four states that registered a decline in GDP, and at minus-2.4 percent was the worst performer. It was a major reversal for Oklahoma's economy, which grew a robust 6.5 percent in the first quarter.