求翻译：从收集到的数据，它表明被划分成4个不同群体的年龄组的百分比。他们是20岁以下，20至30岁和30至50岁之间，50岁以上。在下面所示的百分比（图2）。是什么意思？

From the collected data, it shows that are divided into 4 age-adjusted percentage of different groups. They are 20 years old, among the aged and 20-30 and, over the age of 50. The percentage shown in the following (Figure 2).