Hi Britmantoo. Where did you get that info from? The Dairy Global article that bbko posted a link to?
If so, I think you have misunderstood what you read.
The article does not say that 40% of Thai milk comes from NZ, another 11% from OZ. It says that:
"The top 3 leading exporters of dairy products to Thailand are New Zealand (40.6% market share), Australia (11.1%), and the US (6.6%). New Zealand and Australia together make up about 50% of Thailand’s dairy imports and have free trade agreements with Thailand."
So, of all the dairy products Thailand imports, 40% comes from New Zealand and 11% comes from Australia, So, 40% and 11% of dairy products imported into Thailand, not of all Thai milk.
It does not say what percentage that is of all milk in Thailand. It could be any figure, maybe even zero.
Also, the article says "dairy products", not milk. I have seen a lot of New Zealand cheese for sale in Thailand but I have never seen New Zealand or Australian milk.