The exact percentage isn't shown but you can see this value on the Bell Curve graph which is in the LeakTracker page.
The graph as shown is a
normal curve so the likelihood of falling in each section is as shown in the linked picture (note that for the tail end we condense everything to just show at the far end - if you're more than +3SD or less than -3SD that's about all you need to know).
If you want to see the actual numbers you can find them in the log file. The Sets number is just flopping sets with pocket pairs, the flushes is turning or rivering a flush given that you had a flush draw and saw the street, and the straights are for combined open-ended, double gutshot and single gutshot straight draws.