Possible Clues:

• Natl. figure
• Significant econ. indicator
• Econ 101 topic
• Macroeconomic stat. [the other one]
• National econ. figure
• Natl. economic indicator
• The world total was approx. $70 trillion in 2011
• National economic indicator, for short
• National econ. yardstick
• Annual IMF calculation