Margins
| TTM | 2018 | 2017 | 2016 | 2015 | 2014 | |
|---|---|---|---|---|---|---|
| Gross margin | 43.9% | 43.8% | 44.6% | 46.2% | 46.0% | 44.8% |
| Gross margin growth (bps) | -63 | -74 | -166 | 27 | 120 | 118 |
| Operating margin | 12.2% | 12.2% | 13.8% | 13.9% | 13.6% | 13.2% |
| Operating margin growth (bps) | -184 | -161 | -8 | 26 | 41 | 52 |
| Net profit margin | 5.3% | 5.3% | 12.3% | 11.6% | 10.7% | 9.7% |
| Net profit margin growth (bps) | -702 | -703 | 73 | 92 | 101 | -8 |