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Ontario's debt on debtclock.ca is presented as "Net Debt" from the 2018 Ontario Budget.

The table containing the "net debt" calculation can be found on table 3.30 here: http://budget.ontario.ca/2018/chapter-3d.html

In 2018-19, Ontario's debt is growing by $533.93 every second and will increase by $16.8 billion during this fiscal year.