Rape is legally considered exclusively an act done by a man to a woman, therefore counts exclude raped committed against men
Finally due to stigma in the country and the judicial system often trying to shelter men who commit assault, cases go under-reported and under-prosecuted, lessening the count.
There’s a ton more to it than that, for example:
Martial rape is not considered a crime in India
Rape is legally considered exclusively an act done by a man to a woman, therefore counts exclude raped committed against men
Finally due to stigma in the country and the judicial system often trying to shelter men who commit assault, cases go under-reported and under-prosecuted, lessening the count.