The revenue earned through entry fee and other sources like filming at Taj Mahal complex in Agra during 2012-13 was Rs 24.58 crore, Culture Minister Mahesh Sharma said in a written reply.
In 2013-14, the revenue earning from the world famous monument was Rs 22.40 crore, which has reduced further to Rs 21.78 crore in 2014-15.
However, the expenditure for upkeep of the monument has increased from Rs 12.04 crore in 2012-13 to Rs 13.73 crore in 2013-14 and Rs 16.24 crore in 2014-15.
The interaction of air pollutants, particularly of suspended particulate matter with marble, in combination with other factors may be responsible for the altered aesthetic appearance of the surface in comparison to the original colour and sheen of Taj Mahal, he said.