The Chareidi attrition rate is possibly under 1%. The high end of the estimate is just below 2%, but it is closer to the lower end of 1%. The so-called alternative lifestyle is a minute fraction of a percent -well below a quarter of a percent.
The MO attrition rate is about 25%, according to preeminent MO Rabbi Steven Pruzansky. Clearly far more people don’t fit into a MO lifestyle than a Chareidi one.