In total terms, none - the US is much bigger than other developed countries (unless you count the EU as a bloc, in which case, yes, the EU, by almost three times).
In per-economic-output terms, MANY. The EU average is 0.47% of GNI [1], while the US gives 0.17% of GNI, and Sweden (the outstanding example) gives a whopping 1.4% of GNI. Outside of the EU, Japan gives "only" 30-ish% more than the US, at 0.22%.
Another interesting stand-out is Turkey, which despite being MUCH poorer than the developed world gives 0.54% of GNI.
The United Nations and OECD long-term target is 0.7% of GNI.
[1] GNI is a modified version of GDP which adds income earned abroad by residents and subtracts income earned locally by non-residents.
