15% of Google searches on Android by signed-in users return deep links to apps

"App deep links are the new kid on the block in Search results, and they’re picking up speed faster than you can say “Schema.org ViewAction”! For signed-in users, 15% of Google searches on Android now return deep links to apps through App Indexing. And over just the past quarter, we've seen the number of clicks on app deep links jump by 10x."
Source:  Google Developers Blog, 9th December 2014