More than 2.49 million tourists came to Shanghai during the Spring Festival holiday,a 4.39 percent i

More than 2.49 million tourists came to Shanghai during the Spring Festival holiday,a 4.39 percent i

题目
More than 2.49 million tourists came to Shanghai during the Spring Festival holiday,a 4.39 percent increase on last year.
请教这里的on last year,为什么要加个on呢?
答案
a ...increase on...在...基础上/比...增长了多少.意为:今年春节期间上海游客人数比去年增长了4.39个百分点.
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