Table:
|  |  | YearEnded |  |
| --- | --- | --- | --- |
|  | June 30, 2019 | June 24, 2018 | June 25, 2017 |
|  |  | (in thousands) |  |
| Contractual interest coupon | $100,712 | $77,091 | $95,195 |
| Amortization of interest discount | 3,937 | 12,225 | 22,873 |
| Amortization of issuance costs | 1,426 | 2,034 | 2,414 |
| Effect of interest rate contracts, net | 4,086 | 3 | (4,756) |
| Total interest cost recognized | $110,161 | $91,353 | $115,726 |
Paragraphs:
Interest Cost
The following table presents the amount of interest cost recognized relating to both the contractual interest coupon and amortization of the debt discount, issuance costs, and effective portion of interest rate contracts with respect to the Senior Notes, convertible notes, the term loan agreement, commercial paper, and the revolving credit facility during the fiscal years ended June 30, 2019, June 24, 2018, and June 25, 2017.
The increase in interest expense during the 12 months ended June 30, 2019, is primarily the result of the issuance of $2.5 billion of Senior Notes in March 2019.
Question:
What is the percentage change in the Amortization of interest discount from 2018 to 2019?
Answer: (3937-12225)/12225 = -67.8