Table:
For the Year Ended December 31,	Change

2018	2017	Amount	Percentage

(dollars in thousands)

Revenue:

Subscription and returns	$254,056	$199,942	$54,114	27%

Professional services	18,042	13,217	4,825	37%

Total revenue	$272,098	$213,159	$58,939	28%

Answer the following question leveraging the tabular data along with the context text, include the steps to get the answer if you wish, but end your response with {"answer": ["ANSWER"], "scale": "SCALE"} (scale blank when not needed).

Context:
Year Ended December 31, 2018 Compared to Year Ended December 31, 2017
Revenue
Total revenue for the year ended December 31, 2018 increased by $58.9 million, or 28%, compared to the year ended December 31, 2017. Subscription
and returns revenue for the year ended December 31, 2018 increased by $54.1 million, or 27%, compared to the year ended December 31, 2017. Professional
services revenue for the year ended December 31, 2018 increased by $4.8 million, or 37%, compared to the year ended December 31, 2017. Growth in total
revenue was due primarily to increased demand for our products and services from both new and existing customers. Of the increase in total revenue for the year
ended December 31, 2018 compared to 2017, approximately $29.6 million was attributable to existing customers, approximately $28.3 million was attributable to
new customers, and approximately $1.1 million was due to interest income on funds held for customers. Total subscription and returns revenue for 2018 included
$1.2 million related to our cross-border transactions technology acquired in May 2018.

Question: What is the value of revenue from professional services as a percentage of the 2018 total revenue?

(18,042/272,098 ) * 100, therefore {"answer": "6.63", "scale": "percent"}