I want to argue ;-)
1947-1964: 250 LM
1964-1973: 330 GT 2+2
1974-1994: Dino 246 GT
1994-Present: 512 TR
Although I would prefer another classification:
1947-1950: 125 Sport
1951-1960: 250TR
1961-1970: 250LM
1971-1980: Dino 246 GT
1981-1990: 512 BB
1991-2000: F40
2001-present: 360 Spider
It is a tough one because the 288 GTO, 250 Europa, 365 GTB/4 and 550 Maranello also could make it to the list. An yes I know, I have cars in the list that were introduced much earlier like the F40, but they were still produced in the decade I mentioned them.
Niels