Looking at the numbers on the pair of World Tourists
serial - giant date code - head badge date code date
6221243 G0386 (1016) april 11 1986
6272136 G0586 (1486) may 28 1986
6272136 - 6221243 = 50,893 bikes
1486 - 1016 = 47 days
assuming 5 day work weeks
50,893/34 days = 1496 bikes per day...