| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $28,108 | $22,487 |
| 2016 | $28,358 | $22,628 |
| 2017 | $29,232 | $26,344 |
| 2018 | $29,232 | $24,870 |
| 2019 | $27,817 | $26,101 |
| 2020 | $28,183 | $26,467 |
| 2021* | $28,434 | $26,838 |
| 2022* | $28,687 | $27,213 |
| 2023* | $28,942 | $27,594 |
| 2024* | $29,200 | $27,981 |
| 2025* | $29,460 | $28,372 |