| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,423 | $17,599 |
| 2016 | $23,795 | $17,646 |
| 2017 | $23,838 | $16,441 |
| 2018 | $23,838 | $15,915 |
| 2019 | $24,921 | $17,449 |
| 2020 | $23,819 | $16,347 |
| 2021* | $23,862 | $15,824 |
| 2022* | $23,905 | $15,318 |
| 2023* | $23,948 | $14,827 |
| 2024* | $23,991 | $14,353 |
| 2025* | $24,034 | $13,894 |
