its clear you don't understand what a percentage is or what we were even talking about if you make such a ridiculous comment.
1: you are comparing a free upgrade for all previous users fo OSx (to mavericks) adoption rate with that of a paid OS.
2: you're comparing an OS with a limited installation base upgrade path % of users upgrading to that of a very widely accepted industry standard platform that runs everythign from back end, to enterprise to consumer.
3: Enterprise users of Windows do not have free reign to update their OS's when they see fit. Nor do they or can they do it whenever they feel like, often times, in Corporate world, updating platforms takes years (and some cases Decades).
4: Apple is more intrusive to the user with regards to actual upgrades of the Operating system. Apple constantly pops up and says "HEY THERS" A NEW VERSION OF OSx!!!!". Windows does not do this. 
5: again, back to population; 50% of Apples known users updating to Mavericks equates to approximately 30m (2013 estimates 72m isntall base). Windows 8, even though at 14%, actually equates to 168,000,000 people who have moved (Windows was estimated to be installed to over 1.3Billion devices circa 2012).
Which, given #5, really shows that Tim Cook is purposeluy trying to pick and choose statistics to make Apple seem way more dominant in the cmputer marketplace than they truly are.
Don't get me wrong, 50% adoption of Mavericks is great for the Apple community, but it doesn't, nor can it easily be compared to Windows upgrades like Tim Cook, and yourself wants to believe