They are hypothetical market share percentages, but based on claims from BRP (in the annual report) and Polaris.Where are you pulling these percentages from? They weren't in the linked article. I'm not saying they're wrong, but I would have thought Polaris would be closer to Doo. I heard Poo 2 strokes out sold Doo 2 strokes recently, if so - Doo must sell a lot of 4 strokes..
Shortly after launching the 1200 4-Stroke and 600 ACE, Ski-Doo had the number one 4-stroke market share. And now, due to popularity, Ski-Doo has to limit the sales of the 900 ACE .... variants of this engine are also used in PWCs, SXS, and Can-Am tri-wheelers.