The NSE Nifty Dividend Opportunities 50 Index has rallied 22% this year while the NSE Nifty 50 Index advanced a tad below 9%, putting the gap between the two measures near a reading in 2010. “Investors are trying to buy a margin of safety as markets have already run up in the last 2-3 months,” said Rajesh Palviya, a strategist with Mumbai-based Axis Securities Ltd.