Between 1970 and 2000 the US population aged 35 to 44 grew by 43%.请问这里的by是什么意思,有例句最好了,

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Between 1970 and 2000 the US population aged 35 to 44 grew by 43%.请问这里的by是什么意思,有例句最好了,
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Between 1970 and 2000 the US population aged 35 to 44 grew by 43%.请问这里的by是什么意思,有例句最好了,
Between 1970 and 2000 the US population aged 35 to 44 grew by 43%.
请问这里的by是什么意思,有例句最好了,

Between 1970 and 2000 the US population aged 35 to 44 grew by 43%.请问这里的by是什么意思,有例句最好了,
表示:增长了
The price/mix increased by 1.8%.
价格综合指数增长了1.8%.
The economy grew by 14% last year.
去年,经济增长14%.

增长了。。
这里的by 没有特别的意思,只是放在程度词前面

by...增涨了*%