The ratio of revenue to GDP in this list ranges from about 29% to 34% for the eight or so years I checked. Just looking at them, that ratio seems pretty consistent. Yes, it shows that as the GDP grew, more taxes were collected. I don't think anyone is saying or would expect otherwise.
The list doesn't show any tax rates to be correlated to the GDP-revenue ratios.
Even if tax rates were included, we don't know from which marginal brackets the tax revenue was derived or any trends that may be apparent in the tax collected by bracket.
It isn't enough to say the top rate was xx% in a given year if we don't know what part of the total revenue that bracket accounted for - as an example. The same would be true of all brackets, not just the top.
We also don't have any tax code change history which could account for some variations. The IRS/Congress are always messing with tax rules and rates. We would have to track any changes by tax year and have some idea of their effect on revenue by bracket.
The list is good as far as it goes, but it leaves many questions unanswered that are being discussed here.
I am not suggesting you should find the information. It looks like it would be a full time job for about 6-12 months to find the info, do the correlations and make sure it is correct
Dave.