Japanese GDP : 480 trillion yen
Japanese Government Debt (only Federal) : 637 trillion yen (137% of GDP)
Federal Expenditure (2010) : 92.3 trillion
…of which ~20.5 trillion yen is debt servicing cost
Accordingly, the average debt servicing cost is (20.5/637 = ) 3.24%
Federal taxes and other revenue is 44.3 trillion yen, which means borrowing is 48 trillion yen.
Expenditure ex. debt servicing is 71.65 trillion, of which 48 trillion (roughly 2/3) is borrowed.
If you read the last line in the fact-box again, you realize that this is a real horror story. After paying interest on its debt, Japan has only 23.65 trillion yen left, yet it spends 71.65 trillion...
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