Table:
|  | Twelve Months Ended December 31, |  |  |  |  |
| --- | --- | --- | --- | --- | --- |
|  | 2019 | 2018 | 2017 | 2016 | 2015 |
|  | (Dollars in thousands) |  |  |  |  |
| Gross Profit | $114,197 | $89,990 | $72,416 | $60,371 | $54,649 |
| Depreciation expense (a) | 6,370 | 6,089 | 5,791 | 4,028 | 2,566 |
| Plant start-up expense (b) | — | — | — | 1,628 | — |
| Non-cash share-based compensation (c) | 922 | 859 | 243 | 221 | 201 |
| Adjusted Gross Profit | $121,489 | $96,938 | $78,450 | $66,248 | $57,416 |
| Adjusted Gross Profit as a % of Net Sales | 49.4% | 50.2% | 51.5% | 51.1% | 50.6% |
Paragraphs:
The following table provides a reconciliation of Adjusted Gross Profit to Gross Profit, the most directly comparable financial measure presented in accordance with U.S. GAAP:
(a) Represents depreciation and amortization expense included in cost of goods sold
(b) Represents additional operating costs incurred in connection with the start-up of our new manufacturing lines as part of the Freshpet Kitchens expansion project in 2016 that included adding two additional product lines.
(c) Represents non-cash share-based compensation expense included in cost of goods sold.
Question:
What is the percentage change in depreciation expense from 2018 to 2019?
Answer: (6370-6089)/6089 = 4.61