Margins
| TTM | 2017 | 2016 | 2015 | 2014 | 2013 | |
|---|---|---|---|---|---|---|
| Gross margin | 28.7% | 28.8% | 29.2% | 29.1% | 29.0% | 29.4% |
| Gross margin growth (bps) | -34 | -42 | 7 | 18 | -41 | 10 |
| Operating margin | 5.6% | 5.8% | 6.9% | 6.5% | 5.7% | 6.7% |
| Operating margin growth (bps) | -113 | -111 | 37 | 80 | -93 | -59 |
| Net profit margin | 4.1% | 4.0% | 3.9% | 4.5% | -2.2% | 2.7% |
| Net profit margin growth (bps) | 8 | 14 | -62 | 675 | -498 | -135 |