Margins
| TTM | 2017 | 2016 | 2015 | 2014 | 2013 | |
|---|---|---|---|---|---|---|
| Gross margin | 26.9% | 26.7% | 27.8% | 27.3% | 27.1% | 27.7% |
| Gross margin growth (bps) | -20 | -108 | 46 | 23 | -57 | 20 |
| Operating margin | 2.5% | 2.2% | 3.1% | 3.2% | 3.0% | 4.1% |
| Operating margin growth (bps) | 22 | -93 | -2 | 18 | -115 | -57 |
| Net profit margin | 3.2% | 2.8% | 2.8% | 2.1% | 2.0% | 2.7% |
| Net profit margin growth (bps) | 107 | 6 | 72 | 8 | -68 | -39 |