We are probably looking at different sources, but here is one of my sources:
http://reports.weforum.org/global-competitiveness-index/competitiveness-rankings/#series=GOVDEBTGDP
Sort by debt and here you can also see the trend:
The thing is, I believe we are headed into a gruesome recession/depression, and then you wont be able to pay off your debt.
Also, many countries might do a Brexit, like Italy and Catalonia etc. Any of these events will crash the euro.
I dont know exactly whats going to occur, but I wouldnt bet on any fiat currency, thats for sure. Cryptos and gold/silver, that is my way of thinking.