Mumbai, April 14 -- The dollar index continues to loiter around a three-year low on Monday, extending downside amid trade tariff concerns and its potential impact on the US economy. Investors are seen drifting away from the greenback that lost around 3% last week. Currently, the dollar index that measures the greenback against a basket of currencies is quoting at 99.32, down 0.57% on the day. On the U.S. economic front, preliminary data released by the University of Michigan showed a continued slump by U.S. consumer sentiment in the month of April. The University of Michigan said its consumer sentiment index tumbled to 50.8 in April after plunging to 57.0 in March. With the much bigger than expected decrease, the consumer sentiment index ...