Margins
| TTM | 2017 | 2016 | 2015 | 2014 | 2013 | |
|---|---|---|---|---|---|---|
| Gross margin | 28.9% | 28.9% | 29.7% | 29.5% | 29.4% | 29.8% |
| Gross margin growth (bps) | -80 | -80 | 15 | 14 | -41 | 7 |
| Operating margin | 6.0% | 6.0% | 7.2% | 7.5% | 6.2% | 7.3% |
| Operating margin growth (bps) | -115 | -115 | -34 | 125 | -101 | -58 |
| Net profit margin | 4.1% | 4.1% | 3.9% | 4.6% | -2.3% | 2.8% |
| Net profit margin growth (bps) | 14 | 14 | -62 | 681 | -502 | -133 |