This is a swipe of the Dominican Republic. If you tap on the blue dots you will see the population of 1970, and if you click on the red dots you get the population of 2012. The swipe is an easy and effective tool to use. As you can see it shows that the population is growing in one particular area and shrinking in others. I chose the colors red and blue to show the colors of their native flag. Over half the people there are native speakers.