How much of the Palace Museum remained closed to the public in 2012?

The number of visitors to the Palace Museum hit 10 million in 2009. Analysis shows visitors below the age of 30 are the main force, accounting for 40 percent of the visitors to the Forbidden City. Museum officials say the number of off-season visitors has seen steady growth in 2018, taking up nearly 30 percent of all visits to the palace complex. The Palace Museum is now 80 percent accessible to the public, up from just 20 percent in 2012.