Table:
|  | Number of Shares | Weighted Average Exercise Price per Share |
| --- | --- | --- |
| Outstanding at March 31, 2016 | 913,508 | $33.00 |
| Exercised | (437,906) | 34.34 |
| Forfeited or expired | (42,485) | 34.26 |
| Outstanding at March 31, 2017 | 433,117 | 31.51 |
| Exercised | (131,666) | 31.75 |
| Forfeited or expired | (17,111) | 34.73 |
| Outstanding at March 31, 2018 | 284,340 | 31.21 |
| Assumed upon acquisition | 141,751 | 25.86 |
| Exercised | (140,118) | 27.67 |
| Forfeited or expired | (4,091) | 39.62 |
| Outstanding at March 31, 2019 | 281,882 | $30.16 |
Paragraphs:
Stock option and stock appreciation right (SAR) activity under the Company's stock incentive plans in the three years ended March 31, 2019 is set forth below:
The total intrinsic value of options and SARs exercised during the years ended March 31, 2019, 2018 and 2017 was $8.3 million, $7.4 million and $9.6 million, respectively. This intrinsic value represents the difference between the fair market value of the Company's common stock on the date of exercise and the exercise price of each equity award.
The aggregate intrinsic value of options and SARs outstanding at March 31, 2019 was $14.9 million. The aggregate intrinsic value of options and SARS exercisable at March 31, 2019 was $14.8 million. The aggregate intrinsic values were calculated based on the closing price of the Company's common stock of $82.96 per share on March 29, 2019.
As of March 31, 2019 and March 31, 2018, the number of option and SAR shares exercisable was 278,591 and 224,022, respectively, and the weighted average exercise price per share was $30.03 and $29.96, respectively.
There were no stock options granted in the years ended March 31, 2019, 2018 and 2017
Question:
Which years does the table provide the number of outstanding shares for?
Answer: 2016, 2017, 2018, 2019