Democratic Sen. Chris Murphy is shining a spotlight on gun violence and the hundreds of mass shootings that took place in 2015 in effort to push Congress to pass gun legislation.

The Connecticut senator spent New Year's Eve tweeting details about each mass shooting of 2015 in the U.S. The staunch gun control advocate titled his series of tweets his "year in review."

"372+ mass shootings, countless lives forever changes by gun violence. Day by day, month by month," he tweeted Thursday afternoon.

Murphy used statistics and data about the shootings from shootingtracker.com, which defines mass shootings as any where at least four people are injured.

He even tweeted about a shooting that left four people dead on Christmas day.

However, the deadliest massacre of the year occurred on Dec. 2, when a married couple opened fire at the Inland Regional Center in San Bernardino, California, during a Christmas party, killing 14 people and wounding 21 others. The couple was killed during a shootout with police after the attack. Meanwhile, officials later discovered that the suspects were individually self-radicalized long before they got married and moved to California.

Murphy added that all members of Congress should vow to fight against gun violence and advance gun control legislation as a New Year's resolution.

Murphy's call for gun action spilled into Friday when he applauded President Barack Obama for promising to announce a new executive action to expand background checks on gun sales. The congressman said he was "proud" that Obama plans to expand background checks since the Republican-controlled Congress refugees to take action.