Table:
Year Ended December 31,

2018	2017	Change

Other Operating Data

Average Revenue Per Unit (ARPU)

ARPU—on-net	$ 480	$ 506	(5.1)%

ARPU—off-net	$ 1,155	$ 1,239	(6.8)%

Average price per megabit	$ 0.82	$ 1.11	(25.9)%

Customer Connections—end of period

On-net	68,770	61,334	12.1%

Off-net	10,974	9,953	10.3%

Answer the following question using the table plus the background text, respond with any necessary explanation, then provide the JSON object {"answer": ["ANSWER"], "scale": "SCALE"} as the final output (use an empty string for scale if irrelevant).

Background:
Year Ended December 31, 2018 Compared to the Year Ended December 31, 2017
Our management reviews and analyzes several key financial measures in order to manage our business and assess the quality of and variability of our service revenue, operating results and cash flows. The following summary tables present a comparison of our results of operations with respect to certain key financial measures. The comparisons illustrated in the tables are discussed in greater detail below.

Question: What is the percentage change in the number of on-net customer connections between 2017 and 2018?

((68,770 - 61,334)/61,334 ) * 100, therefore {"answer": "12.12", "scale": "percent"}