What years did May 13th fall on a Friday in the 20th century?

In the 20th century, May 13th fell on a Friday in the years 1921, 1927, 1932, 1938, 1949, and 1955. Additionally, it occurred again in 1960, 1966, 1977, and 1983. The last occurrence of May 13th falling on a Friday in the 20th century was in 1988.