ArtDaily.org has the attendance figures for Madrid’s Prado which have remained at 2009’s record levels though the museum’s website saw a 10% increase:

The Museo del Prado, in 2010, concluded the third consecutive year surpassing the 2.7 million annual visitors, a figure that was reached for the first time since the opening of its expansion. The final number of visitors received by the Museum during this year, 2,732,000, has been almost equal to that recorded in 2009, 2,764,155, and in 2008, 2,759,029 the first full year period of the expansion in full operation.  As for the reasons to visit, a 57.58% of the total audience visited the permanent collection only, while the remaining 42.42% came to the Museum to visit the temporary exhibitions.

Prado Museum Loses Visitors in 2010 but More Students and Tourists Visit the Museum (ArtDaily.org)