Although the rise of Flandria had been steady, its decline was swift. Bicycle sales were strong, but moped sales fell off rapidly. New Belgian legislation making the wearing of helmets mandatory, and a law limiting mopeds to 40km/h (25mph) contributed to a sharp decline in their popularity. Production of mopeds fell from over 100,000 units in 1969 to almost half that in 1973. However, the biggest contributor to the decline was the influx of Japanese mopeds and motorbikes that were beginning to flood the market. Sales of bicycles also began to decline, and by 1979 production had dwindled to just 32,000.