Possible Clues:

• National econ. indicator
• Macroeconomic stat. [the other one]
• Econ 101 topic
• The world total was approx. $70 trillion in 2011
• Natl. figure
• Natl. economic indicator
• Econ 101 subj
• National econ. yardstick
• Annual IMF calculation
• It's about $14 trillion annually, for the U.S.