| First Generation (1935–1940) |
Fourth Generation (1955–1959) |
Seventh Generation (1973–1991) |
Tenth Generation (2007–2014) |
| Second Generation (1941–1946) |
Fifth Generation (1960–1966) |
Eighth Generation (1992–1999) |
Eleventh Generation (2015–2019 |
| Third Generation (1947–1954) |
Sixth Generation (1967–1972) |
Ninth Generation (2000–2006) |
Twelfth Generation (2020-Current) |