Table:
|  | Year Ended December 31, |  |  |  |  |
| --- | --- | --- | --- | --- | --- |
|  | 2019 | 2018 | 2017 | 2016 | 2015 |
| Consolidated Statement of Operations Data |  |  | (Dollars in thousands except share and per share data) |  |  |
| Net sales | $ 245,862 | $193,237 | $152,359 | $129,707 | $113,505 |
| Cost of goods sold | 131,665 | 103,247 | 79,943 | 69,336 | 58,856 |
| Gross profit | 114,197 | 89,990 | 72,416 | 60,371 | 54,649 |
| Selling, general and administrative expenses | 114,450 | 94,876 | 75,167 | 62,586 | 58,297 |
| Loss from operations | (253) | (4,886) | (2,751) | (2,215) | (3,648) |
| Other income (expenses), net | 5 | (102) | (525) | (182) | 449 |
| Interest expense | (991) | (296) | (910) | (698) | (455) |
| Loss before income taxes | (1,239) | (5,284) | (4,187) | (3,095) | (3,653) |
| Income tax expense | 144 | 77 | 75 | 66 | 58 |
| Net loss attributable to common stockholders | $(1,383) | $(5,361) | $(4,262) | $(3,161) | $(3,711) |
| Net loss per share |  |  |  |  |  |
| Basic | $(0.04) | $(0.15) | $(0.12) | $(0.09) | $(0.11) |
| Diluted | $(0.04) | $(0.15) | $(0.12) | $(0.09) | $(0.11) |
| Weighted Average shares of common stock outstanding |  |  |  |  |  |
| Basic | 35,950,117 | 35,329,170 | 34,487,239 | 33,674,416 | 33,497,940 |
| Diluted | 35,950,117 | 35,329,170 | 34,487,239 | 33,674,416 | 33,497,940 |
Paragraphs:
ITEM 6. SELECTED FINANCIAL DATA
The following selected consolidated financial data should be read together with our consolidated financial statements and accompanying notes and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” appearing elsewhere in this report. The selected consolidated financial data in this section is not intended to replace our consolidated financial statements and the accompanying notes. Our historical results are not necessarily indicative of our future results.
We derived the consolidated statements of operations data for the fiscal years ended December 31, 2019, 2018 and 2017 and the consolidated balance sheets data as of December 31, 2019 and 2018 from our audited consolidated financial statements appearing elsewhere in this report. The consolidated statement of operations data for the years ended December 31, 2016 and 2015 and the consolidated balance sheet data as of December 31, 2017, 2016 and 2015 have been derived from our audited consolidated financial statements, which are not included in this report.
Question:
What is the percentage change in gross profit from 2018 to 2019 year end?
Answer: (114197-89990)/89990 = 26.9