I looked up a few books today, and while I couldn't find any tables, I did find values for 0 and 100% humidity. You could probably use excel to plot the rest of the data points; its almost certainly linear, or at least very close to it.
0% = .24 (BTU/ft^3)
100% = .86
(at 70F and 1 Bar as I recall)
So its actually pretty significant.
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