I apologize for having phrased my comment such that it implies European countries are not contributing. The Baltics, Poland, and Norway [0] are contributing outsized amounts to Ukraine. Russia's (most recent) invasion hits close to home for them, and it shows.
Your chart actually illustrates what I was trying to say, which is that some of the largest EU countries, namely Germany, France, and Italy, have been hesitant to act on a larger scale that would possibly put them in the crosshairs of Russian retaliation. France, being the only sovereign nuclear power remaining in the EU, is particularly important. Having its largest countries be more willing to flex military power would let the EU act outside the shadow of the US and be considered a superpower in its own right.
Your chart actually illustrates what I was trying to say, which is that some of the largest EU countries, namely Germany, France, and Italy, have been hesitant to act on a larger scale that would possibly put them in the crosshairs of Russian retaliation. France, being the only sovereign nuclear power remaining in the EU, is particularly important. Having its largest countries be more willing to flex military power would let the EU act outside the shadow of the US and be considered a superpower in its own right.
[0] News to me, albeit unsurprising.