You're right kitchen sink. I forgot about those first few REALLY awkward months for the PS2 when there was no supply and they launched at a BAD time (was march or something if I remember). To make my point right I'd have to give the PS2 a mulligan on the first half year to year.
If you adjust the chart to start the PS2 off in November of its launch year it looks a lot more sensical.
PSN ID: ChosenOne feel free to add me