What is considered a good ROI on $8 180 player turbo SNGS?

I play $8 180 turbo SNGS on stars, stats are currently: Played games 219, ROI 47.7%, ITM 12.8%. What is considered good on this type of game.

ROI about 50% is good. <500 games - not too much to understand how well you play, but if in 13% of itm big part is 1-9 places, you do well in this level