Welcome to the forum.
There are likely no increases for your size. The dash is probably holding the place of a 0 for your size although it seems that it would be more straightforward to then give the stitch count within the second parentheses. You can check by comparing the last time a stitch count was given and the next time that a stitch count was given. See if those numbers make sense.
One question: there are 9 sizes for the pattern, one plus the 8 in parentheses?