This occupation supported 3,814,700 jobs in 2012 and 4,068,300 jobs in 2014, reflecting an increase of 6.6%. In 2012, this occupation was projected to increase by 18.0% in 2022 to 4,500,500 jobs. As of 2014, to keep pace with prediction, the expected number of jobs was 3,951,800, compared with an observed value of 4,068,300, 2.9% higher than expected. This indicates current employment trends are better than the 2012 trend within this occupation. In 2014, this occupation was projected to increase by 13.9% in 2024 to 4,599,700 jobs. Linear extrapolation of the 2012 projection for 2022 results in an expected number of 4,637,600 jobs for 2024, 0.8% higher than the 2014 projection for 2024. This indicates expectations for future employment trends are about on track with the 2012 trend within this occupation.