Public opinion polls done in those countries.
Now, I have no problem with Asians, but I find it interesting how they are so commonly overlooked. The Asian population as a percentage of the population has been increasing FAR faster than the Hispanic, but no one seems to have noticed.
The Asian population in the US has quadrupled since 1980, during that same period of time the Hispanic population has doubled. The difference is that Hispanics were a larger group to begin with in 1980.
But here's the kicker:
There were about the same percent of Hispanics in the US in 1980 as their are Asians in the US now. But the Asian population is growing twice as fast and unlike the Hispanics, there are literally billions of Asians (3 billion) but only 500 million Hispanics.