Yes, yearly.
The top chart that comes up shows how a "theoretical you" would have done historically starting in 1871 with your assets, spending, and asset allocation and going forward for 30 years (or whatever you chose) and subtracting your spending, and adding in your theoretical investment returns based on what actually happened during those 30 years. Then it does the same thing starting in 1872, then 1873, and so on.
Each line represents how your net worth would have risen or fell during each 30 year period.
Since the 30 year period starting in 1871 and the 30 year period starting in 1872 overlap by 29 years, you'll see the lines zig and zag next to each other.
Any line that goes below zero is considered a failure as "theoretical you" ran out of money in that particular scenario.
Hope that helps.