The loonie was down 0.47 of a cent at 76.76 cents US. That's the lowest level since September 2004.
The dollar has been on a downward slide since last summer, when the price of oil started to weaken.
Oil prices dropped below the US$50 mark in trading Wednesday, while gold traded for less than US$1,100 an ounce.
Compounding the loonie weakness was a decision by the Bank of Canada to cut its key interest rate last week.
The central bank's overnight rate target stands at 0.5 per cent.
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