1992 317 vehicles 1991 14,128 vehicles 1990 32,157 vehicles 1989 15,379 vehicles 1988 182 vehicles 1987 124 vehicles 1986 103 vehicles 1985 155 vehicles 1984 273 vehicles 1983 20,872 vehicles 1982 21,463 vehicles 1981 24,124 vehicles 1980 132 vehicles