Although people are posting all these figures and stuff, just think about it logically for a second. When you grow from childhood to adulthood all aspects of your body maintain some sort of relative proportions (so your arms won't just grow and your legs won't). If you break average height by geographic location I think you'll find that black people are on average the tallest and asians the smallest. Therefore assuming they are growing somewhat reasonably they should be on average bigger. That being said you're probably looking at the maximum a couple centimeters which quite frankly ain't that much.