Table:
Year Ended December 31,

2018	2017	2016	2015	2014

(in thousands)

Total net revenue	$3,298,177	$2,214,253	$1,708,721	$1,267,118	$850,192

Less: Starbucks transaction-based revenue	—	—	78,903	142,283	123,024

Less: transaction-based costs	1,558,562	1,230,290	943,200	672,667	450,858

Less: bitcoin costs	164,827	—	—	—	—

Add: deferred revenue adjustment related to purchase accounting	$12,853	$—	$—	$—	$—

Adjusted Revenue	$1,587,641	$983,963	$686,618	$452,168	$276,310

Answer the following question drawing on the given table and text, produce your answer and, if helpful, briefly explain your calculation. Conclude with JSON: {"answer": ["ANSWER"], "scale": "SCALE"} ("scale" = "" if no unit).

Text:
Adjusted Revenue has limitations as a financial measure, should be considered as supplemental in nature, and is not meant as a substitute for the related financial information prepared in accordance with GAAP. These limitations include the following:
• Adjusted Revenue is net of transaction-based costs, which is our largest cost of revenue item; • Adjusted Revenue is net of bitcoin costs, which could be a significant cost; • The deferred revenue adjustment that is added back to Adjusted Revenue will never be recognized as revenue by the Company; and • other companies, including companies in our industry, may calculate Adjusted Revenue differently or not at all, which reduces its usefulness as a comparative measure.
Because of these limitations, you should consider Adjusted Revenue alongside other financial performance measures, including total net revenue and our financial results presented in accordance with GAAP.
The following table presents a reconciliation of total net revenue to Adjusted Revenue for each of the periods indicated:

Question: Which year has the least amount of transaction-based cost?

From ROW6 find the smallest number and the corresponding year in ROW2, therefore {"answer": "2014", "scale": ""}