Margins
| TTM | 2017 | 2016 | 2015 | 2014 | 2013 | |
|---|---|---|---|---|---|---|
| Gross margin | 34.7% | 34.7% | 34.9% | 35.0% | 35.9% | 36.4% |
| Gross margin growth (bps) | -22 | -22 | -7 | -93 | -52 | -41 |
| Operating margin | 6.0% | 6.0% | 5.5% | 7.6% | 9.8% | 10.8% |
| Operating margin growth (bps) | 53 | 53 | -217 | -217 | -97 | -32 |
| Net profit margin | 2.8% | 2.8% | 2.4% | 4.2% | 5.3% | 5.9% |
| Net profit margin growth (bps) | 42 | 42 | -176 | -117 | -52 | -20 |