| Set up, operate, or tend machines to crush, grind, or polish materials, such as coal, glass, grain, stone, food, or rubber. | 
  | 
| Mean Wage History | 
| Year | This Occupation | Compared to Occupational Group | Difference | 
| Current | $22.05 |   | $17.86 | 
  | $4.19 | 
| 2015 | $21.35 | +3.3% | $17.29 | 
+3.3% | $4.06 | 
| 2014 | $20.87 | +2.3% | $16.90 | 
+2.3% | $3.97 | 
| 2013 | $20.47 | +1.9% | $16.58 | 
+1.9% | $3.89 | 
| 2012 | $20.13 | +1.7% | $16.31 | 
+1.7% | $3.83 | 
| 2011 | $19.81 | +1.6% | $16.04 | 
+1.6% | $3.76 | 
| 2010 | $19.59 | +1.1% | $15.87 | 
+1.1% | $3.72 | 
| 2009 | $19.25 | +1.8% | $15.59 | 
+1.8% | $3.66 | 
| 2008 | $18.75 | +2.7% | $15.19 | 
+2.7% | $3.56 | 
| 2007 | $18.32 | +2.3% | $14.84 | 
+2.3% | $3.48 | 
| Year | This Occupation | Compared to All Occupations | Difference | 
| Current | $22.05 |   | $20.85 | 
  | $1.20 | 
| 2015 | $21.35 | +3.3% | $20.27 | 
+2.9% | $1.08 | 
| 2014 | $20.87 | +2.3% | $19.83 | 
+2.2% | $1.03 | 
| 2013 | $20.47 | +1.9% | $19.43 | 
+2.1% | $1.04 | 
| 2012 | $20.13 | +1.7% | $19.10 | 
+1.7% | $1.03 | 
| 2011 | $19.81 | +1.6% | $18.80 | 
+1.6% | $1.01 | 
| 2010 | $19.59 | +1.1% | $18.48 | 
+1.7% | $1.11 | 
| 2009 | $19.25 | +1.8% | $18.23 | 
+1.4% | $1.02 | 
| 2008 | $18.75 | +2.7% | $17.77 | 
+2.6% | $0.98 | 
| 2007 | $18.32 | +2.3% | $17.20 | 
+3.3% | $1.12 | 
  | 
| Reference Date: 1st Quarter 2016 |