The Sensex at the Bombay Stock Exchange ended with a moderate gain of 72 points at 20,117, on Monday. The Nifty at the National Stock Exchange added 17 points to close at 6,036.Stocks markets in Japan, China, Hong Kong, South Korea and Singapore rose between 0.7 and 1.4 percent. In Europe also, all the key indices in UK, Germany and France were slightly higher in intra-day trade, on Monday.