20% Increase in Currency Supply in 4 months!

Just making an observation that the total amount of currency in circulation (Physical + Bank Credit) has increased an unprecedented 20% in the last 4 months. I believe, when we are looking at this chart, we are looking at a Credit Bubble.

Something that bothers me. Current National Debt is around $24.2T, however, we have $18.4T in total dollars in circulation. So even if you use every dollar in existence to pay off the National Debt, you still have $5.8T USD in debt remaining... how does that get paid off?? Need to dig more into this.