According to a report in the Financial Express (April 8th, 2012):

The net investment by foreign institutional investors (FIIs) in stock market during 2011-12 was the lowest in the last three years at Rs 47,935 crore.

FIIs made a net investment of Rs 47,935 crore in the equity market during the fiscal ended March 31, 2012, which was way below the figure of Rs 1.1 lakh crore in 2010-11 and Rs 96,857 crore during 2009-10, according to the SEBI data.

Source: http://www.financialexpress.com/news/fii-investment-in-stocks-falls-to-3yr-low/934109/0

The numbers above would tantamount to the following approximate figures after factoring in exchange rate variations:

FY 2011-12: Rs.479.35 billion / $9.6 billion ($1=Rs.50, approx. figure)
FY 2010-11: Rs.1100.00 billion / $24.1 billion ($1=Rs.45.58, FY average value)
FY 2009-10: Rs.968.57 billion / $20.4 billion ($1=Rs.47.42, FY average value)