Apologies for the lack of support on the chart, SVG rendering is terrible in Firefox.
If you click on the 'Day' view and then 'Show only Mavericks' you can clearly see a rise from 0.20% at 7pm yesterday up to almost 10% at 5pm today. The other lines have had a slight decrease, but yes it does look like Mountain Lion users are upgrading fastest. I'd be surprised if Leopard/Tiger users upgraded quickly as I'm sure they'd be apprehensive of updating their old and potentially fragile kit.
If you click on the 'Day' view and then 'Show only Mavericks' you can clearly see a rise from 0.20% at 7pm yesterday up to almost 10% at 5pm today. The other lines have had a slight decrease, but yes it does look like Mountain Lion users are upgrading fastest. I'd be surprised if Leopard/Tiger users upgraded quickly as I'm sure they'd be apprehensive of updating their old and potentially fragile kit.