What year did September 21 fall on a Thursday?

Taking from the start of the 20th century, the 21st of September has been on a Thursday in 1905, 1911, 1916, 1922, 1933, 1939, 1944, 1950, 1961, 1967, 1972, 1978, 1989, 1995, 2000 and 2006. It will next be on a Thursday in 2017 and then 2023.