percentages是什么意思？

In other words, communities with high levels of per-capita income growth, high percentages of two-parent families, and high local government spending — which may stand for good schools — are the most likely to help poor children relive Horatio Alger's rag

Yet, when you look at their numbers or percentages on the revenue-generating sports teams of football and basketball, they make up well into 50 and 60 percent of those teams.