Does anyone know roughly how many custard tarts are made each year in the UK or worldwide?

Sainsburys sell around 70 million custarrd tarts or custard based pastry products each year so if we assume that figure is accurate and consider the number of other retail outlets, Tesco, Safeway, Asda, etc then the figure quickly rises into the "this is a silly number" area... suffice to say it is lots.. lots and lots.