Relative magnitude, really? You’re undermining your own point by not using a representative example and then calling your example a relative magnitude to the others.
210 billion to 250 billion = ~19% increase
75,000 to a million = ~12,000% increase
Nanometer to micrometer = ~99,000% increase
Nanometer to 5 millimeters = ~499,999,900% increase
210 billion is not substantially smaller than 250 billion. Are you intentionally trying to miss the point?