What is today's national debt as a percentage of GDP? What was the average percentage in the '90s?

Answer 1

74.43%

($8.717tillion debt/ $11.712trillion GDP)

Finding the value from last decade is variable since the debt fluctuated throughout the year. You would need calculus to figure that out.

For 1990 though, it's 32.87%.

($3.233t/ $9.837t)