1993 1,637 vehicles 1992 1,755 vehicles 1991 1,630 vehicles 1990 2,745 vehicles 1989 3,345 vehicles 1988 2,270 vehicles 1987 1,960 vehicles 1986 995 vehicles 1985 441 vehicles 1984 718 vehicles 1983 451 vehicles 1982 306 vehicles 1981 235 vehicles 1980 244 vehicles