Figure 4From: The attrition rate of licensed chiropractors in California: an exploratory ecological investigation of time-trend data Increase in licensed chiropractors, 1970-2008. The number of licensed chiropractors rose from 4306 in 1970 to 11,637 in 1998, a rise of 170.2%. The total number of active licenses has continued to rise and was 13,822 in 2008.Back to article page