Instructions: In this task, given a sentence in the Chinese language, your task is to convert it into the English language.
Input: 零售物价指数（RPI）的整体通胀率也从2009年12月的百分之2.4上升至2010年1月的百分之3.7。
Output:
The headline inflation rate of the Retail Prices Index (RPI) also increased from 2.4% for the month of December 2009 to 3.7% for the month of January 2010.