an increase in
/ən ˈɪnkriːs ɪn/
a rise in the amount, number, or level of something (countable/uncountable depending on context; usually uncountable when referring to a general rise).
中文释义：……的增加
The chart shows an increase in the number of people using bicycles.
该图表显示骑自行车人数有所增加。