Margins
| TTM | 2017 | 2016 | 2015 | 2014 | 2013 | |
|---|---|---|---|---|---|---|
| Gross margin | 40.6% | 40.6% | 40.4% | 39.8% | 39.5% | 39.2% |
| Gross margin growth (bps) | 1 | 28 | 54 | 34 | 31 | -25 |
| Operating margin | 5.1% | 5.7% | 4.8% | 4.5% | 4.3% | 4.5% |
| Operating margin growth (bps) | -2 | 95 | 23 | 21 | -15 | -149 |
| Net profit margin | 3.2% | 3.6% | 2.9% | 2.8% | 2.2% | 2.4% |
| Net profit margin growth (bps) | 4 | 66 | 19 | 55 | -24 | -94 |