pre_text: The following table provides a reconciliation of EBITDA and Adjusted EBITDA to net loss, the most directly comparable financial measure presented in accordance with U.S. GAAP: (a) Represents new store marketing allowance of $1,000 for each store added to our distribution network, as well as the non-capitalized freight costs associated with Freshpet Fridge replacements. The expense enhances the overall marketing spend to support our growing distribution network. (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 the change of fair value for the outstanding common stock warrants. All outstanding warrants were converted to common stock in September 2017. (d) Represents fees associated with secondary public offerings of our common stock (e) Represents charges associated with our former Chief Executive Officer’s separation agreement as well as changes in estimates associated with leadership transition costs. (f) Represents fees associated with two securities lawsuits
table: Twelve Months Ended December 31,
table: 2019 2018 2017 2016 2015
table: (Dollars in thousands)
table: Net loss $(1,383) $(5,361) $(4,262) $(3,161) $(3,711)
table: Depreciation and amortization 15,921 14,068 12,692 9,887 7,574
table: Interest expense 991 296 910 698 455
table: Income tax expense 144 77 75 66 58
table: EBITDA $15,673 $9,080 $9,414 $7,490 $4,376
table: Loss on disposal of equipment 787 142 104 190 94
table: Non-cash share-based compensation 7,834 6,808 4,438 4,193 3,924
table: Launch expense (a) 4,563 3,540 3,066 2,813 2,626
table: Plant start-up expenses (b) — — — 1,628 —
table: Warrant fair valuation (c) — — 335 49 (503)
table: Secondary offering expenses (d) 302 362 — — 593
table: Leadership transition expenses (e) — — 63 1,291 —
table: Litigation expense (f) — 348 145 — —
table: Adjusted EBITDA $29,159 $20,280 $17,565 $17,654 $11,110
table: Adjusted EBITDA as a % of Net Sales 11.9% 10.5% 11.5% 13.6% 9.8%
question: Analyse this data from a financial earnings document. What was the average adjusted EBITDA for 2018 and 2019?