How much black money overseas?

The Hindu reported yesterday that our Prime Minister Dr. Manmohan Singh will ensure the return of black money deposited in foreign banks. Click here to read the news. The news says, "While no official data is available on the quantum of slush funds, it is estimated that such black money stashed away by Indian nationals in tax havens overseas could be worth nearly $140 billion."

That amounts to approximately 10% of our GDP.