Mumbai, April 26 -- Markets are bracing for turbulence in the days to come, an index of investors' apprehensions showed, as uncertainty over election outcome and rising crude oil prices loom over the economy. The National Stock Exchange's (NSE's) India VIX index, which tracks investors' perceptions of volatility for at least a month ahead, has soared 54% in the year so far. On Tuesday, the index stood at 24.60, the highest in three years. India VIX, which fell 5.98% in March, has risen 43.4% in April. So far this year, NSE's 50-share Nifty index has gained over 9%. On Tuesday, the Nifty closed at 11,575.95, points, down 0.16%. In 2018, India VIX had climbed 26.3% while the Nifty rose 3.15%. In 2017, VIX slipped 18.1% and Nifty gained 28.7%....