Why coal India with consistent ROE of greater than 20 percent underperformed ?
the price is falling due to the instabilty in supply and demand
But I mean it has never performed. Businesses with ROE greater 20% are wealth creaters. 
I have been holding Coal for 10 years. Every thing was good about this stock in terms of business monopoly etc. However its completely mismanaged since its under public/govt enterprise. They paid dividend but net net its a no profit no loss stock in 10 year when i check for returns. (just because dividend ensured its does not give negative returns) .I got this share in ipo around 280 odd but now its 120 around.
Reason for falling :
1.OFS news around stock…this is incase of most govt stock due to disinvestment.
2.Badly managed enterprise due to too much govt employee ,bureaucracy, corruption etc…most of govt managed companies stay away.
3.Its a company made to employ govt employee and feed them.
4.If you want to invest there are many good pvt companies invest in them you will get reasonable returns
but sure returns better then fd.