I'm trying to fill out my Indian visa form online and when I get to the SAARC countries visited, I've clicked on Sri Lanka, the year I went and the number of visits, but it won't let me continue, saying that the number of visits is a 'mandatory field'. I'm not sure what I'm doing wrong.
Delete all the rows and then add one again, I ran into the same issue today. Best of luck on your visa application.
Put a best estimate and add a note.
Did you read the instruction? Sometime they have some indication in case of high number of visits, or a temporal period (in last 10 years).
If you cannot trace them (so no stamp on passport), probably also they cannot get it.