  | 
| Mean Wage History | 
| Year | This Occupation | Compared to Occupational Group | Difference | 
| Current | $18.26 |   | $17.86 | 
  | $0.40 | 
| 2015 | $17.68 | +3.3% | $17.29 | 
+3.3% | $0.39 | 
| 2014 | $17.28 | +2.3% | $16.90 | 
+2.3% | $0.38 | 
| 2013 | $16.95 | +1.9% | $16.58 | 
+1.9% | $0.37 | 
| 2012 | $16.67 | +1.7% | $16.31 | 
+1.7% | $0.37 | 
| 2011 | $16.40 | +1.6% | $16.04 | 
+1.6% | $0.36 | 
| 2010 | $16.23 | +1.1% | $15.87 | 
+1.1% | $0.36 | 
| 2009 | $15.94 | +1.8% | $15.59 | 
+1.8% | $0.35 | 
| 2008 | $15.53 | +2.7% | $15.19 | 
+2.7% | $0.34 | 
| 2007 | $15.17 | +2.3% | $14.84 | 
+2.3% | $0.33 | 
| Year | This Occupation | Compared to All Occupations | Difference | 
| Current | $18.26 |   | $20.85 | 
  | -$2.59 | 
| 2015 | $17.68 | +3.3% | $20.27 | 
+2.9% | -$2.58 | 
| 2014 | $17.28 | +2.3% | $19.83 | 
+2.2% | -$2.55 | 
| 2013 | $16.95 | +1.9% | $19.43 | 
+2.1% | -$2.47 | 
| 2012 | $16.67 | +1.7% | $19.10 | 
+1.7% | -$2.42 | 
| 2011 | $16.40 | +1.6% | $18.80 | 
+1.6% | -$2.39 | 
| 2010 | $16.23 | +1.1% | $18.48 | 
+1.7% | -$2.25 | 
| 2009 | $15.94 | +1.8% | $18.23 | 
+1.4% | -$2.28 | 
| 2008 | $15.53 | +2.7% | $17.77 | 
+2.6% | -$2.23 | 
| 2007 | $15.17 | +2.3% | $17.20 | 
+3.3% | -$2.02 | 
  | 
| Reference Date: 1st Quarter 2016 |