its changed over the course of the two decades with the giants and the suns entering the league. they entered the comp in 2011/12 respectively.Mmm leaving out some important context here kranky:
Vic teams made up 59.4% of all teams over the same period.
Non-Vic teams made up 40.6% of all teams.
So non-Vic teams have been over-represented in the top 4.
this has bought it up to 44.4% and 55.5% respectively.
but the too 4 comparo has other modifiers that havnt been taken into account.
1) essendon asada - they lost draft picks and indeed a whole season as well as players leaving.
2) melbourne tanking and the subsequent losing culture it created - they still havnt recovered from that.
3) carltons salary cap cheating, loss of draft picks and tanking creating a poor culture and lack of success.
those three statistical outliers more than make up for the tiny percentage difference between interstate teams in the comp and their top 4 participation.