This occupation supported 43,800 jobs in 2012 and 53,700 jobs in 2014, reflecting an increase of 22.6%. In 2012, this occupation was projected to decrease by 8.4% in 2022 to 40,099 jobs. As of 2014, to keep pace with prediction, the expected number of jobs was 43,000, compared with an observed value of 53,700, 24.9% higher than expected. This indicates current employment trends are much better than the 2012 trend within this occupation. In 2014, this occupation was projected to decrease by 4.6% in 2024 to 51,700 jobs. Linear extrapolation of the 2012 projection for 2022 results in an expected number of 39,300 jobs for 2024, 24.0% lower than the 2014 projection for 2024. This indicates expectations for future employment trends are much better than the 2012 trend within this occupation.