Table:
|  |  | Year Ended |  |
| --- | --- | --- | --- |
|  | April 26, 2019 | April 27, 2018 | April 28, 2017 |
| Shares issued under the ESPP | 3 | 4 | 4 |
| Proceeds from issuance of shares | $ 96 | $ 85 | $ 80 |
Paragraphs:
Employee Stock Purchase Plan
Eligible employees are offered shares through a 24-month offering period, which consists of four consecutive 6-month purchase periods. Employees may purchase a limited number of shares of the Company’s stock at a discount of up to 15% of the lesser of the market value at the beginning of the offering period or the end of each 6-month purchase period. On September 13, 2018, the ESPP was amended to increase the shares reserved for issuance by 2 million shares of common stock. As of April 26, 2019, 7 million shares were available for issuance. The following table summarizes activity related to the purchase rights issued under the ESPP (in millions):
Question:
Which years does the table provide information for activity related to the purchase rights issued under the ESPP?