But that chart still shows sony is ahead in FF market share, right? Do you think they've always been ahead? Or do you think they got ahead in the past few years before that chart?? This is common sense 3rd grade stuff bud.
The chart shows the FF mirrorless market share. Sony released the market's first FF MILC in 2013 (it's not a coincidence that came soon after Canon entered the APS-C MILC market, which Sony had dominated up to that point). If Sony sold even a single FF MILC in 2013, they'd have 100% market share. Same in 2014, and unless you count Leica (which no one does, their sales don't even make a blip on anyone's charts) it was the same in 2015 and 2016.
You're asking for 10 years of data, but don't you realize that 2020 was the first year that ILC makers produced more MILCs than DSLRs? In 2017, the year the chart to which you are referring starts, Sony had 100% of FF MILC sales, but MILCs as a whole comprised only 34% of ILCs shipped that year. And since FF models have consistently represented ~10-12% of the market for the past several years, 100% of the FF MILC market is ~4% of the total market in 2017. So what was everyone else buying? The pros and prosumers, like most consumers, were mostly buying DSLRs.
They lost a crap load of users, me included. I've seen many famous photographers on social media switch to sony in the past few years. Many of my peers in the industry have left canon for sony.
No matter how many times someone says the earth is flat, it will remain (roughly) spherical. Similarly, no matter how many times you claim a significant fraction of the industry left Canon for Sony, it won't become true. So far, your data are 1) very limited in scope (FF camera sales in one country for one year), 2) erroneously interpreted (the BCN FF MILC data where you switched Canon and Sony and drew the diametrically incorrect conclusion), and 3) irrelevant to your own main point (data on all MILCs when you have repeatedly stated you are referring to the professional or 'prosumer' market).
TL;DR: you don't represent the market, bud.