| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $24,934 | $20,370 |
| 2016 | $24,584 | $19,900 |
| 2017 | $24,584 | $20,193 |
| 2018 | $24,584 | $20,733 |
| 2019 | $23,313 | $18,821 |
| 2020 | $23,156 | $18,664 |
| 2021* | $23,001 | $18,509 |
| 2022* | $22,847 | $18,355 |
| 2023* | $22,694 | $18,203 |
| 2024* | $22,542 | $18,052 |
| 2025* | $22,391 | $17,902 |