Table:
|  |  | Years Ended December 31, |  |
| --- | --- | --- | --- |
| (in thousands, except per share amounts) | 2019 | 2018 | 2017 |
| Amount paid to repurchase shares | $  — | $95,125 | $29,993 |
| Number of shares repurchased | — | 1,696 | 422 |
| Average repurchase price per share | $  — | $56.07 | $71.07 |
Paragraphs:
Share Repurchase
In September 2015, our Board of Directors authorized a program to repurchase up to $150.0 million of our common stock over a thirty-month period. In November 2017, our Board of Directors approved an extension of the share repurchase program to December 2019 from its original maturity of March 2018. In May 2018, our Board of Directors approved a $50 million increase in its authorization to repurchase shares of our common stock under this same program.
On December 18, 2019, the Board of Directors authorized to remove the expiration date to the Company’s share repurchase program and increase the authorized amount by $25.1 million. As of December 31, 2019, the Company is authorized to repurchase shares of the Company’s common stock of up to a total of $50.0 million.
ADVANCED ENERGY INDUSTRIES, INC. NOTES TO CONSOLIDATED FINANCIAL STATEMENTS – (continued) (in thousands, except per share amounts)
In order to execute the repurchase of shares of our common stock, the Company periodically enters into stock repurchase agreements. During the years ended December 31, 2019, 2018 and 2017 the Company has repurchased the following shares of common stock:
Question:
What was the percentage change in the average repurchase price per share between 2017 and 2018?
Answer: ($56.07-$71.07)/$71.07 = -21.11