I have a pretty wide variance in my test results (13 points) depending on which test it was and when I took it. Normally the variance is under 10 points between testings, but I started at 5 or 6 and have taken over a dozen entirely different test types (SB, WAIS, WISC, Mega, Titan, etc), so it's not all that unusual to have the slightly wider gap.
At the lowest end there are 13,057 people equal or higher, at my highest score there are 247. My most common result (where I figure I actually am) is 659.
Oh, and for those of you calculating from percentile, don't forget that it's STILL percentile...so carry two decimal places. You can check your results by computing based on rarity given in that chart (ie 311,591,917/rarity). The two should nearly match if you've done your math correctly.