West Indian Lime not flowering

I have 2 citrus in the garden, a Meyer Lemon and a West Indian Lime. Both went in about 3 years ago and are doing quite well. While the Lemon has had plenty of fruit (currently about 15-20 mature fruit that should be ready for the new year) the Lime just hasn't produced. Over the 3 years I've probably had 4 limes from it, which I don't mind given it's quite young, however it hasn't had a decent flowering at all. I noticed a single flower on it today. Perhaps it's just a matter of waiting.