Prices have fallen by a quarter since January.

自1月份以来，物价下降了1/4。

《柯林斯英汉双解大词典》

I've been working out the gym since January.

我从一月起就一直在健身房锻炼。

youdao

Job losses had fallen every month since January.

自1月以来，新失业人数逐月下降。

youdao

Also,new claims for unemployment aid fell last week to the lowest number since January.

VOA: special.2009.11.06

Since the 1st of January it has become more and more evident to my mind that the war is henceforth to be conducted upon a different basis.

自元旦以来,我越来越明白,至此,实际上战争,被触发的起点不同

耶鲁公开课 - 美国内战与重建课程节选

All this happened since January, when President Obama took office.

VOA: special.2009.08.08

The GSPCA has been looking after Jethou Bumblebee since November and Hanois since January.

BBC: Guernsey animal charity to release two seal pups

The emerging-growth fund is among the top-performing equity funds of 2003, returning 24% since January.

FORBES: Magazine Article

Krzanich, Intel's chief operating officer since January 2012, will become the sixth CEO in Intel's history.

ENGADGET: Intel names current COO Brian Krzanich as new CEO, starts May 16th