Game List | right-click | Statistics > Win-%
This statistic shows the performance (white and black wins).
At the top of the window the total number of games is displayed. If you add the white wins, the draws and the black wins, the resulting number could be less than the total number of found games displayed. This only happens if not all the game results are known.
The pie chart has three colors: white for white wins, gray for draws and black for black wins. Finally, two total percentages are shown. To calculate these percentages, half the number of draws are added to the white wins, and half the number of draws are added to the black wins.