Follow the crowd:  According to the U.S. Census Bureau, the fastest-growing states from 2004 to 2005 were Arizona and Nevada, each seeing a 3.5% increase.  Right behind them were Idaho at 2.4%; Florida at 2.3%; Texas, North Carolina and Georgia at 1.7%; and Colorado at 1.4%.  The biggest declinerss were the District of Columbia at -.7%; Rhode Island at -.3% and New York and Massachusetts at -.1%.  As a whole, the U.S. grew by .9%.