The National Index, which covers all nine U.S. Census divisions, reported a 4.4% annual gain in March, which was an increase from 4.2% in February. The 20-city Index increased from 3.5% in February to 3.9% in March. Phoenix, Seattle and Charlotte reported the highest gains. Phoenix led the way with an 8.2%, followed by Seattle with a 6.9% increase and Charlotte with a 5.8% increase.