  | 
| Mean Wage History | 
| Year | This Occupation | Compared to Occupational Group | Difference | 
| Current | $21.59 |   | $19.44 | 
  | $2.15 | 
| 2015 | $20.81 | +3.8% | $18.74 | 
+3.8% | $2.07 | 
| 2014 | $20.40 | +2.0% | $18.37 | 
+2.0% | $2.03 | 
| 2013 | $19.99 | +2.0% | $18.00 | 
+2.0% | $1.99 | 
| 2012 | $19.65 | +1.7% | $17.70 | 
+1.7% | $1.96 | 
| 2011 | $19.30 | +1.8% | $17.38 | 
+1.8% | $1.92 | 
| 2010 | $18.99 | +1.6% | $17.10 | 
+1.6% | $1.89 | 
| 2009 | $18.63 | +1.9% | $16.78 | 
+1.9% | $1.86 | 
| 2008 | $18.12 | +2.8% | $16.32 | 
+2.8% | $1.80 | 
| 2007 | $17.55 | +3.3% | $15.80 | 
+3.3% | $1.75 | 
| Year | This Occupation | Compared to All Occupations | Difference | 
| Current | $21.59 |   | $20.85 | 
  | $0.74 | 
| 2015 | $20.81 | +3.8% | $20.27 | 
+2.9% | $0.54 | 
| 2014 | $20.40 | +2.0% | $19.83 | 
+2.2% | $0.57 | 
| 2013 | $19.99 | +2.0% | $19.43 | 
+2.1% | $0.56 | 
| 2012 | $19.65 | +1.7% | $19.10 | 
+1.7% | $0.55 | 
| 2011 | $19.30 | +1.8% | $18.80 | 
+1.6% | $0.50 | 
| 2010 | $18.99 | +1.6% | $18.48 | 
+1.7% | $0.51 | 
| 2009 | $18.63 | +1.9% | $18.23 | 
+1.4% | $0.40 | 
| 2008 | $18.12 | +2.8% | $17.77 | 
+2.6% | $0.36 | 
| 2007 | $17.55 | +3.3% | $17.20 | 
+3.3% | $0.35 | 
  | 
| Reference Date: 1st Quarter 2016 |