Today it's about 6 per cent of the budget. On par with the percentage from the 1950s though 80s. Spiked in 90s.
There will be a time to worry, perhaps, but today is not that day, nor is it on the horizon. Current levels are sustainable.
Just out of curiosity, what do you think the economy would look like with no government debt? What would a mortgage cost? Government debt isn't just something we owe, it's also something we own.
Like I said before, I hope you're right.