Yes, Cardiff figures are 11,568 passengers in total which makes it 187 per flight - which is 74% in total.
(Don't know how you're doing your maths, but there were 11,568 passengers and 62 flights in August and 11568/62 equals 186.58(187). Then 187 is 73.6% (74%) of 254).
By comparison, Birmingham had 12,462 passengers which makes a total of 201 per flight - which is a load factor of 79% in total.
Pretty good for a route that only started a few months ago.
Obviously this doesn't tell us about yield. However, I've got quite a few fare alerts setup and CWL doesn't seem to be that much cheaper than BHX, MAN, LHR or LGW. And there definitely haven't been any J class firesales (Which I'm pretty unhappy about!).