The bull market is still charging. Despite yesterday’s 160-point retreat, the Dow closed out the year up 7.5 percent, while the S&P finished up 11.4 percent and the Nasdaq climbed 13.4 percent. Investors shrugged off economic worries to put U.S. and Chinese stocks on the year’s list of top performers. Meanwhile, oil prices plunged 46 percent in their biggest drop since 2008. With the U.S. recovery still young, a seventh straight year of gains in 2015 seems more than plausible.