Clark County — Clark County welcomed 16.8 percent fewer new arrivals in September, compared with the same month last year, as measured by local driver’s license applications. According to the Washington Department of Licensing, 1,160 people traded in out-of-county driver’s licenses for local ones last month, about even with August’s 1,104 applications and down significantly from 1,394 Clark County licenses issued in September 2010. Statewide, there were 14.8 percent fewer driver’s licenses exchanged during September. Licensing data is considered a population indicator. Through September, driver’s license exchanges totaled 10,223 in Clark County, a 7.5 percent decline from 11,050 licenses issued during the same nine-month period in 2010.