150 billion rupees of black money recovered: Pranab

India's Finance Minister Pranab Mukherjee on Tuesday said the authorities have discovered cases of tax evasion worth 150 billion rupees in the last 18 months.Speaking at a news conference in New Delhi,Mukherjee refused to name the account holders citing secrecy clauses attached to legal frameworks with different countries,which are used to obtain information on Indian account holders in foreign banks.