| First Generation (1964–1967) |
Second Generation (1968–1972) |
Third Generation (1973–1977) |
Fourth Generation (1978–1983) |
| Fifth Generation (1997–2005) |
Sixth Generation (2005–2008) |
Seventh Generation (2008–2012) |
Eighth Generation (2012–2016) |
| Ninth Generation (2016–Present) |
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