@Henry Yang 这个图非常有wow factor,but if you increase the maximum value of the secondary axis by 20 times (大约全体毕业生数),the wow factor dissapears. Anybody who has done any excel graphes knowes the trick.
btw,i do think,I do think it's getting harder for chinese kids to get into good school, so this is not to challenge your view, but providing input for strength of your evidence.