Who owns the information, he owns the world!
That's why we provide our players with as much data about the playing process as possible. Our Hourly Bonus is the best acknowledgment of this fact indeed.
There you can find your All-time win statistics if you tap the 'Stats' tab when you get the results of spinning. This tab shows all your progress from the very first day of playing.
This way, you can figure out which items should be upgraded primarily to give you more profit and which of them can wait a bit since they are not so lucky for you.