Only six of the allies meet the informal, admittedly informal, two percent GDP benchmark. Only half of the allies make the 20 percent they should spend on new equipment.

Aviation Week reported earlier this year that NATO Funding Disparity Persists:

European NATO members continue to spend, on average, well under 2 percent of gross domestic product (GDP) on defense, according to new figures provided by the Atlantic alliance.

The average for European allies is 1.7 percent, whereas the U.S. GDP allotment in 2008 was 4 percent, NATO says. The U.S. spends by far more per-capita on defense than any other NATO members. In fact, the U.S. last year spent about 44 percent more on defense than all other NATO members combined.