Margins
| TTM | 2017 | 2016 | 2015 | 2014 | 2013 | |
|---|---|---|---|---|---|---|
| Gross margin | 31.8% | 31.8% | 32.5% | 33.2% | 33.3% | 33.9% |
| Gross margin growth (bps) | -68 | -68 | -74 | -1 | -59 | 20 |
| Operating margin | 15.0% | 15.0% | 13.8% | 12.0% | 12.1% | 11.9% |
| Operating margin growth (bps) | 124 | 124 | 176 | -5 | 24 | 93 |
| Net profit margin | 9.6% | 9.6% | 8.8% | 7.6% | 7.7% | 7.5% |
| Net profit margin growth (bps) | 80 | 77 | 118 | -9 | 17 | 54 |