The Federation of Indian Airlines (FIA) is an airline industry body in India. Its members are Jet Airways, IndiGo, SpiceJet and GoAir. As of March 2017, the four members of the FIA have a combined 80% share of the domestic aviation market. The functions of the FIA are carried out by an Executive Council composed of the heads of each of the member airlines.
In March 2016, the four members of the FIA had a combined 80% share of the domestic aviation market. 
The context states that the four members had an 80% share in 2017, and it is possible the number was the same in 2016. There is no data given for 2016, so there is no way of knowing. The system was probably confused because the only date mentioned is 2017. 