1996 141 vehicles 1995 292 vehicles 1994 425 vehicles 1993 477 vehicles 1992 745 vehicles 1991 811 vehicles 1990 2,307 vehicles 1989 2,575 vehicles 1988 2,702 vehicles 1987 3,579 vehicles 1986 4,303 vehicles 1985 3,973 vehicles 1984 3,077 vehicles 1983 2,035 vehicles 1982 1,661 vehicles 1981 2,432 vehicles 1980 4,741 vehicles