Among the 50 states and DC between 1990 and 2012, only one has seen the share of its non-Hispanic white population grow. In the other 50, whites have declined as a percentage of the total population.
If the curiously explicit inclusion of DC didn't give it away, well, the one exception is the nation's capital, where whites have increased from 27.8% of the population in 1990 to 35.3% in 2012. In the US as a whole, white dropped from constituting 75.6% of the population in 1990 to 62.8% of the population in 2012.
The seat of federal power--where perennial amnesty proposals and 'prosecutorial discretion' have worked indefatigably to reduce whites to minority status nationwide--becomes steadily more white as the rest of the country becomes less so. Rumor has it Kent Brockman relocated to DC several years ago.