The game was called footy in the 1850s. It became known as Victorian Rules when it spread to the other states in the 1870s. Nobody cares what goes on in the SANFL.Because Victorians will tell you that they are twice as good as the SANFL, which only gives 2 points for a win and 1 point for a draw.
Same goes for percentage
SANFL is calculated as For/(For + Against) so average = 50% and approximate maximum = 67% (assuming For is double Against)
AFL is calculated as For/Against, so average = 100% (which is better than the SANFL maximum) and approximate maximum = 200% (assuming For is double Against)