The 1.9% figure is based on web hits to a more reliably neutral site (Wikimedia/Wikipedia). It's still focused on American and European audiences according to a lot of people though. Some claim that it is 4 or 5% worldwide, but it's hard to aggregate any reliable figures for that claim. It's an estimate. It might even be closer to the truth worldwide, but Wikimedia sites provide a more reliable overall record of the progress of growth, and they show it to be pretty steady over the last few years.