What's the percentage of simplified characters in the most common characters?
according to http://blog.sina.com.cn/s/blog_4d3f04b40100ffxk.html
有学者王鼎吉统计：以国家语委、国家教委1988年1月26日联合发布的《现代汉语常用字表》为例，在3500个常用字中，有简化字1116个，占31.9%，即不到三分之一
there are 31.9% character undergo simplification in the most common 3500 characters.