Table:
Year Ended December 31,	Change

2019	2018	$	%

(dollars in thousands)

Research and development	$ 50,024	$ 41,305	$ 8,719	21.1%

% of revenue	25%	28%

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

Context:
Research and Development Expense
Research and development expense increased by $8.7 million in 2019 compared to 2018. The increase was primarily due to a $5.4 million increase in employee-related costs, which includes stock-based compensation, associated with our increased headcount from 229 employees as of December 31, 2018 to 252 employees as of December 31, 2019, a $1.3 million increase in hosting and software related cost to support research and development activities and an increase of $0.4 million in office related expenses to support research and development activities. In addition, a total of $6.5 million of internally-developed software costs during 2019 and $7.7 million of internally-developed software costs during 2018 were capitalized, resulting in an increase of the expense by $1.2 million compared to 2018.

Question: What is the change in the % of revenue from 2018 to 2019?

25 - 28, therefore {"answer": "-3", "scale": "percent"}