Number of vehicles produced

"Sales of the Boxster series, in turn, amounting to 22,806 units as of the end of May, were only slightly below the previous year's figure, the two Cayman and Cayman S mid-engined coupés accounting for 13,586 units sold."


So I was off by a lot. According to this, in that 10 month period, Porsche made 9,220 Boxsters (22,806 - 13,586). So about 12,000 in a year are made.