According to a poster on another forum, 8,897 passengers used the route in Sept 2018.
That averages at 148.2 passengers per flight and a load factor of 58%. To be honest, that is worse than I expected. Whilst I did expect low figures in the winter, I didn't expect it to go this low this quickly. I dread to think what figures we'll see in November and February.
Hopefully Qatar will be happy. I imagine they'll be quite happy with the summer figures - though perhaps less so with the winter. Of course, this tells us nothing about yield. However, it does paint a picture.