Serial number range: 2411021-3887706 (1970-2000, approx. 36,822 produced). Production by year: 1970: #2411021-2411040 (20 units); 1971: #2470501-2494050 (6,000 units); 1972: #2515501-2517550 (2,050 units); 1976: #2805401-2807400 (2,000 units); 1977: #2845051-2847050 (2,000 units); ... ; 1994: #3676531-3677030 (500 units); 1995: #3702552-3729790 (651 units); 1997: #3794010-3798409 (1,000 units); 1998: #3820625-3821624 (1,000 units); 2000: #3887207-3887706 (500 units)