What is the demand for vegetarian food in Da Lat?

Hello, This is Rao, I would like to know the vegetarian trend in Vietnam, in particular Da Lat.
1. What is the percentage of vegetarians in Vietnam?
2. What are the main motivations for preferring vegetarian food?
3. How often do they eat vegetarian food?

Your inputs and ideas about vegetarian food are highly appreciated!

Thanks,
-Rao

Coming from the north, it seems that part of the Buddhist tradition is much more widespread in the south. I was impressed at the amount of chay places in Dalat when I visited. In Nam Dinh where I am now, for example, there's exactly one -___-