Rugby union football was held at the Olympics in 1900, 1908, 1920 and 1924.
Polo is considered the oldest mounted team sport, with a history reaching back centuries, when it was played in the plains of Asia, ancient Persia, China and India.
Polo was on the Olympic programme in 1900, 1908, 1920, 1924 and 1936.
The winter Olympics were begun in 1924 and were held in the same year as the summer games until the 1994 winter games in Lillehammer, Norway, when the alternating cycles began.
The 1992 Olympics in Barcelona, Spain, reflected a changed political landscape: the 172 participating nations and territories included the Unified Team (with athletes from 12 former Soviet republics), a reunited Germany, and South Africa, which was allowed to compete for the first time since 1960.
The Olympic games are competitions of individual athletes, not of nations, and the IOC does not keep national scores; however, the media of all nations report national standings according to one of two scoring systems.