Attendance at the Metropolitan Museum of Art reached a record high of 5.68 million people in its fiscal year 2011; it rose again, significantly, to 6.28 million in 2012. It fell, slightly, in 2013, to 6.2 million. Attendance numbers for fiscal year 2014 should be available in two weeks or so.
But, while attendance may be flat (or not! we'll see), have you checked out how many followers the Met has on Instagram?