What is the @OECD counting when it claims that US general government interest expenses come to almost 4% of GDP?

What is the @OECD counting when it claims that US general government interest expenses come to almost 4% of GDP? Standard US sources e.g. CBO say 1.6% for net interest outlays @LauBooneEco https://t.co/P5SwHGwXEA

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