Serial number range: 2703601-3852099 (1974-1998, approx. 18,700 produced). Production by year: 1974: #2703601-2718150 (350 units); 1975: #2752051-2753050 (1,000 units); 1976: #2773201-2791150 (2,150 units); 1977: #2842051-2858600 (2,000 units); 1995: #3698001-3700000 (2,000 units); 1996: #3744589-3764799 (4,400 units); 1997: #3776980-3805859 (3,800 units); 1998: #3834875-3852099 (3,000 units).