I need a decent graph-and/or table of the income of an average train engeneer makes in Toyko, Japan?

ok, so im doing this stupid project in school on Tokyo, Japan. one of the things i need for this project is a graph or table on an interesting statistic on Tokyo. i picked the income on the average train engeneer since there is like alot of ppl in Tokyo and most of them ride the subs. so could ya could help me out a bit and help me find a picture of a graph-table with the yearly income