Yup. No matter how much it sucks and discourages retakers, the statistics do show that most of them don't improve more than a point or two overall. Of course this does not apply to SDN retakers as statistically SDN'ers rock the damn thing
Alot of August people are retakers so that may contribute to lower overall numbers. None of that really matters though; all that really does is how hard you work and the time you put in to doing your absolute personal best, whenever you decide to take the test.