Sources for macro economic forecast data
GDP: If I remember correctly, Congressional budget office offers 10-12 yr forward potential gdp every quarter, from which you can derive predicted potential growth. 

PopGrowth: U.S. Census has this data

Inflation: Fed Res/Philidelphia provides inflation forecast

Account deficit: All the sources for 5 or more years forecast in int. trade are either proprietary or highly unreliable. Best of luck in your search.