| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $22,500 | $13,874 |
| 2016 | $22,600 | $12,118 |
| 2017 | $22,600 | $12,252 |
| 2018 | $22,600 | $11,950 |
| 2019 | $23,000 | $14,459 |
| 2020 | $23,500 | $14,959 |
| 2021* | $23,603 | $15,125 |
| 2022* | $23,707 | $15,293 |
| 2023* | $23,812 | $15,463 |
| 2024* | $23,916 | $15,634 |
| 2025* | $24,022 | $15,808 |