Funding as percent of GDP is a meaningless metric. You need to adjust for inflation, but funding as a percent of GDP was some weird argument made to try to explain why modern NASA has become relatively ineffectual, but it has no meaningful connection to reality.
The Apollo Program cost a total of $183 billion, inflation adjusted, over 12 years. That's about $15 billion a year. NASA's budget has been for the past 40 years has been $20-$30 billion a year. Even the 'burst funding' wasn't particularly extreme relative to what they now regularly receive. The highest their budget ever was was in 1966 in $57 billion (inflation adjusted) dollars.
To visualize the absurdity of this argument imagine somebody claiming that Uganda funding a space program for $5 billion is receiving some serious financial capital, because that happens to be 10% of their GDP. $5 billion is $5 billion, regardless of your GDP. Ok technically there's PPP calculations, but that doesn't apply to the discussion here.
