The newest measure of the oil industry ’s falling fortunes came on Tuesday in the form of a $3.3 billion fourth-quarter loss reported by BP . For all of 2015, BP said it lost $6.48 billion, compared with a profit of $3.78 billion in 2014, before the plummeting price of oil began taking its full toll. The stock of the British company plunged on the news, down more than 7 percent through midmorning trading in London. Petroleum futures were off, too, as investors and analysts awaited the fourth-quarter results later on Tuesday from ExxonMobil, the industry’s biggest player. Despite oil’s per-barrel price being in the low $30s, down from levels above $65 as recently as May, […]