The net national debt in 2001 was at a 20-year low of about 35% of GDP, and today it stands at 50% of GDP.

2001年国债净额是20年里最低的，大约为GDP的35%，而今天它达到GDP的50%。

youdao

America's predicted deficits over the next decade come to as much as $12 trillion, to be piled on top of an existing net national debt of around $10 trillion.

美国未来十年的计划赤字高达12万亿美元，而且是现有国家净债务10万亿美元的累加。

youdao

As a result the net national debt (debt held by the public) will more than double to 90% by 2020 from 40% in 2008.

WSJ: David Ranson: The Revenue Limits of Tax and Spend

If we want to understand the true burden of health entitlements, we need to account for not only what we spent on them directly, but also the fair share of net interest payments on the national debt attributable to these same entitlements.

FORBES: The Hidden Costs of Health Entitlements are Growing at Triple the Rate of Health Entitlements