‘According to available data, over the last 50 years, Europe has spent on average around 1.8% - 2.2% of its GDP on defense, with recent trends showing a slight increase towards the 2% mark; however, this can vary significantly depending on the specific European country and time period analyzed.’
‘According to available data, over the last 50 years, the United States has spent on average around 3.5% of its GDP on defense. Some sources indicate a slightly higher figure, with a 50-year average closer to 4.2% of GDP.’
……..
Call the gap 1.5% of European GDP for 50 years. And let’s take the year 2000 as the representative median year.
‘According to available data, the European Union's GDP in the year 2000 was approximately $9.5 trillion USD in nominal terms, representing a significantly smaller figure compared to the US GDP at the time.’
…………..
The references are from enquiries to Google’s AI
So a rough number for the amount of money by which Europe has lagged the US in defending the free world is 50x 9500 billions x2/100=9500 billion or $9.5 trillion. This of course is not a current value of the number which would include the cumulative product of this money reinvested, which would be substantially larger.
Nor does it reflect various trends like the narrowing of the gap when when the GDP numbers were more recent and larger. It’s a SWAG, but sufficient for our purposes..
Put another way Europe owes the Free world one whole year of its entire economy. They should be less vociferous.