US Federal Debt, since 1900:
In 2013, it really looked like the US federal debt was on its way down to depression era levels. Since then, the value of the USD has stopped following the decay curve with a Half-life of about 4 years, and instead has begun to slowly grow in gold value, rising about 35% from 19.5 mg to 26.4 mg. This has allowed the Federal Debt to resume its growth, rising from 300 kt in 2012 to 500 kt in June 2015. Even so, it is still far below its 2001 peak of 660 kt.