The number of Americans working on oil and gas wells has dried up to its lowest level in more than a year. Employment in in oil-and-gas extraction fell by 3,300 in April to a seasonally adjusted 194,400, t he Labor Department said Friday. That’s the fewest since March 2014 and represents a year-over-year decline for an industry that until recently had been a growth engine for the labor market. The decrease comes while the broader economy added 223,000 jobs to payrolls last month . Employment in the energy-extraction sector reached 201,500 in October. The recent peak, driven by the expansion of hydraulic fracturing, […]