it's like 70%, more than certainly the same order of magnitude. each planet closer to the sun has to zoom faster than the one before it, to not fall in
I'm aware of how orbital mechanics works, but I brought up units specifically since 70% is close to the ratio between kilometers and miles. The orbital speed of Mercury, for reference, is much closer: https://www.wolframalpha.com/input/?i=orbital+speed+of+mercu...
