Track FRC over time

Hi, I’m trying to track my FRC over time. I’ve created a custom chart on the Comparisons tab that plots W’bal against days, but this doesn’t seem to work. I don’t mind having a line for each year, but ideally there would be just one line plotting my FRC (average for each ride) over time. Hopefully it is increasing! I’ve read some posts on this forum about W’ and W’bal but they don’t answer this question. Thanks for any help.