Margins
| TTM | 2018 | 2017 | 2016 | 2015 | 2014 | |
|---|---|---|---|---|---|---|
| Gross margin | 35.7% | 35.7% | 31.8% | 32.5% | 33.2% | 33.3% |
| Gross margin growth (bps) | 144 | 389 | -68 | -74 | -1 | -59 |
| Operating margin | 19.0% | 19.0% | 15.0% | 13.8% | 12.0% | 12.1% |
| Operating margin growth (bps) | 147 | 400 | 124 | 176 | -5 | 24 |
| Net profit margin | 14.9% | 13.6% | 9.6% | 8.8% | 7.6% | 7.7% |
| Net profit margin growth (bps) | 330 | 406 | 77 | 118 | -9 | 17 |