Measuring population in moving boxes

Las Vegas Sun reports:

May was the first month in 12 years that fewer than 5,000 people traded in driver’s licenses from elsewhere for Nevada licenses in Clark County, according to Keith Schwer, director of the Center for Business and Economic Research at UNLV, who has kept tabs on population growth for years.

The May total of 4,612 is also nearly 23 percent less than the figure for the same month of 2007, the largest such decline since at least as far back as January 2005.