| 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 | $14.75 |   | $19.17 | 
  | -$4.42 | 
| 2015 | $14.28 | +3.3% | $18.56 | 
+3.3% | -$4.27 | 
| 2014 | $13.96 | +2.3% | $18.14 | 
+2.3% | -$4.18 | 
| 2013 | $13.69 | +1.9% | $17.80 | 
+1.9% | -$4.10 | 
| 2012 | $13.47 | +1.7% | $17.50 | 
+1.7% | -$4.03 | 
| 2011 | $13.25 | +1.6% | $17.22 | 
+1.6% | -$3.97 | 
| 2010 | $13.11 | +1.1% | $17.03 | 
+1.1% | -$3.92 | 
| 2009 | $12.88 | +1.8% | $16.74 | 
+1.8% | -$3.85 | 
| 2008 | $12.54 | +2.7% | $16.30 | 
+2.7% | -$3.75 | 
| 2007 | $12.26 | +2.3% | $15.93 | 
+2.3% | -$3.67 | 
| Year | This Occupation | Compared to All Occupations | Difference | 
| Current | $14.75 |   | $23.35 | 
  | -$8.60 | 
| 2015 | $14.28 | +3.3% | $22.70 | 
+2.9% | -$8.41 | 
| 2014 | $13.96 | +2.3% | $22.21 | 
+2.2% | -$8.25 | 
| 2013 | $13.69 | +1.9% | $21.76 | 
+2.1% | -$8.06 | 
| 2012 | $13.47 | +1.7% | $21.39 | 
+1.7% | -$7.92 | 
| 2011 | $13.25 | +1.6% | $21.05 | 
+1.6% | -$7.80 | 
| 2010 | $13.11 | +1.1% | $20.70 | 
+1.7% | -$7.59 | 
| 2009 | $12.88 | +1.8% | $20.42 | 
+1.4% | -$7.54 | 
| 2008 | $12.54 | +2.7% | $19.90 | 
+2.6% | -$7.35 | 
| 2007 | $12.26 | +2.3% | $19.26 | 
+3.3% | -$7.00 | 
  | 
| Reference Date: 1st Quarter 2016 |