Question about AdvMenu "bar" ratio numbers

[jimlab]

In AdvanceMenu, the "bar" at the top of the menu screen displays the game name, resolution, file size, number of coins and time played.

The bottom "bar" has the ROM name and game year, a pair of numbers displayed as a ratio (xxx/yyy), and something else I'm forgetting at the moment.

It's the ratio I'm curious about. At first, I assumed that it was the number of available games. Then I realized that the number was far too small to represent the number of ROMS I have installed. Even discounting clones and sets, I have 810 games installed. The ratio, at that time, was showing "237/242" or something similar. But the last time I looked, it's showing "151/yyy", and doesn't seem to change based on the game selected, so I'm at a loss as to what this ratio signifies, especially since it's not explained (that I could find) on the AdvanceMAME site, or in the advmenu.txt file.

Anyone know what it means? I have a feeling it's one of those "slap your head, gee don't I feel like an idiot" things, but for some reason it's simply evading me.

Thanks!

[jimlab]

No one?

I posted the same question to the advmame mailing list and haven't received an answer there, either. Maybe no one knows.