No Hispanics/Latinos in TV Commercials?

Watching tv, I stay tuned and watch most of the commercials throughout my viewing time. I notice that nearly ALL commercials that are meant to depict diversity in America show white people, black people, and asian people. I rarely see anyone that is Hispanic or any other ethnicity on these commercials. What, I ask, is the deal? Do an experiment. Go watch TV for 2 hours and see how many hispanics you see on TV commercials. Take special notice that there are nearly always a white person, a black person and an asian person in each and every commercial. Very rarely is there anyone else. If these advertising companies are trying to show the melting pot of American, they clearly have never looked around anywhere where I have ever lived and I've lived a lot of different places. Everyone I've lived, there have been plenty of hispanics around. In California, in Colorado, in Illinois and Iowa, in Nebraska. Many, many more hispanics than asians in fact. So why are they not in commercials? Is it that, perhaps, hispanics are not considered a target for advertising because it is thought they don't have as much money as the other groups? Please...
Just something to think about.