Margins
| TTM | 2017 | 2016 | 2015 | 2014 | 2013 | |
|---|---|---|---|---|---|---|
| Gross margin | 62.7% | 62.5% | 62.2% | 60.7% | 59.7% | 58.1% |
| Gross margin growth (bps) | 29 | 24 | 154 | 99 | 164 | 105 |
| Operating margin | 19.8% | 19.1% | 18.0% | 18.5% | 21.0% | 7.5% |
| Operating margin growth (bps) | 156 | 103 | -50 | -246 | 1,343 | -1,083 |
| Net profit margin | 9.7% | 8.9% | 11.1% | 11.3% | 11.4% | 4.5% |
| Net profit margin growth (bps) | -151 | -227 | -15 | -9 | 689 | -647 |