There is no need to resort to RTI to ascertain pension amounts paid. There is the Central Pension Accounting Office (www.cpao.nic.in) and in the drop down menu of Budget, the amount allotted to each Ministry as well as CGDA towards pensions is readily available. For you convenience I have downloaded and attached the 5mb of details.
In the only debate I was requested to participate on CNN-IBN on 01 Jun 15, I was told that Defence Minister is reported to have said that Rs 8300 crore now and Rs 20,000 crore to Rs 22, 000 crore next year is a huge amount (towards OROP). My retort was this - if the Defence Minister says Rs 8300 crore in FY 2014-15 and Rs 20, 000 crore or Rs 22, 000 crore in FY 2015-16, he has been misinformed unless someone wanted to scare the Government because at 3% increment, my calculator does not gives me Rs 20,000 crore or Rs 22, 000 crore. Due to time constraints, I could not drive home the point that it is like a tenant not paying his monthly rent of Rs 800 and complaining at the end of the year that Rs 9600 is too big an amount to pay from his budget.