The number of buses in Delhi has decreased over the years. In the 1980s, there were 57 buses for every one lakh Delhiites. By 2007-08 the figure had fallen to 34, and today it stands at just 25.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/bus-fleet-shrinks-cars-rush
[2] http://admin.indiaenvironmentportal.org.in/category/author/rumu-banerjee
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-new-delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/buses
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/public-transport
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi-transport-corporation-dtc
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/centre-science-and-environment-cse
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/budget
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/transport