This was the data I plotted:

Seems like Google Sheets just left Ing out from the pie chart since the slice would be < 0.1% 
Before pasting into Sheets, I filtered out even smaller entries to get rid of some garbage from uploaded SGF:s, here is what the full output looked like:
{'aga': 180273, 'japanese': 19531122, 'nz': 37072, 'chinese': 7120701, 'korean': 201751, 'ogs': 266, 'finn': 1, 'ing': 14192, 'aga (area)': 194, 'simple': 69, '1': 46, 'ing rules': 1, 'old chinese': 1, 'jp': 427, 'jpn': 11, 'relay game': 2, 'uchikomi': 96, 'w wins jigo': 34, 'w gives komi': 7, 'white gives ': 1, 'taiwanese (a': 1, 'free placeme': 1, 'free handica': 1, 'aga (territo': 28, '日本': 9, 'aga (fläche': 1, 'японск': 1, 'подсче': 2, 'ja': 1, '': 16, 'aga (地)': 2, '地を数え': 22, 'tang (japane': 1, 'japanische r': 4, 'china': 1, 'stone': 7, 'american': 1, 'kosimplescor': 5, 'japonesas': 2, 'japenese': 1, 'zh': 45, 'mine': 1, 'cn': 8, "ikeda's area": 1, 'egf': 1}
I also think so, but there is a “white_must_pass_last” property in the json which seems to be true whenever the rules are AGA. So maybe an extra pass is just automatically added to the end of the move list in those cases?
I don’t really care enough to dive in and figure out the details, I’ll leave that to someone else 