| First generation (1976–1981) |
Sixth generation (1997–2002) |
| Second generation (1981–1985) |
Seventh generation (2002–2007) |
| Third generation (1985–1989) |
Eighth generation (2007–2012) |
| Fourth generation (1989–1993) |
Ninth generation (2013-2017) |
| Fifth generation (1994–1997) |
Tenth generation (2018–present |
