1992 266 vehicles 1991 681 vehicles 1990 582 vehicles 1989 154 vehicles 1988 153 vehicles 1987 331 vehicles 1986 384 vehicles 1985 531 vehicles 1984 473 vehicles 1983 532 vehicles 1982 605 vehicles 1982 189 vehicles 1981 611 vehicles 1980 1,232 vehicles 1980 259 vehicles