The Hugo Award for Best Novella has been awarded annually since 1968. In addition to the regular Hugo awards, beginning in 1996 Retrospective Hugo Awards, or "Retro Hugos", have been available to be awarded for years 50, 75, or 100 years prior in which no awards were given. Retro Hugos may only be awarded for years after 1939 in which no awards were originally given. To date, Retro Hugo awards have been given for novellas for 1939, 1941, 1943—1946, 1951, and 1954.