先根据横轴分析变化，然后再进行比较。
第一段介绍核心信息；一句话即可
第二三段先分析第一个时间点，再分析后一个时间点。
Excel in something = have advantage in something
图表描述：The graph shows/illustrates/displays
表曲线：
表程度：Fell dramatically/significantly/astonishingly/considerably/steadily to approximately 100 and 200 respectively； noticeable decrease
Slightly/marginally more women than men
表上升 The graph showed an upward trend/ something soars to； Increase/ rise/ grow/ go up/ improve/ climb/ boom/ leap
表下降：decrease/fall/drop/dip/go down/decline/reduce
Exceed/overtake/outnumber e.g. Men with postgraduate diplomas clearly outnumbered their female counterparts.
数值相同：Coal as a source for only 25 units of electricity in 1980， which was matched by natural gas.
