TRIVIAL PURSUITS: Since What Year Has the New Year’s Eve Ball Been Dropped in Times Square?

Since what year has the New Year’s Eve Ball Drop been happening in Times Square?
People have been celebrating New Year’s Eve in Times Square since 1904, but the first Ball Drop didn’t happen until 1907. Since 1907, the ball has been dropped from One Times Square every year, except in 1942 and 1943 due to wartime restrictions on lighting in New York City.