| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,389 | $12,495 |
| 2016 | $22,420 | $13,313 |
| 2017 | $22,881 | $14,290 |
| 2018 | $22,881 | $12,590 |
| 2019 | $23,433 | $14,463 |
| 2020 | $23,393 | $14,423 |
| 2021* | $23,875 | $15,368 |
| 2022* | $24,367 | $16,374 |
| 2023* | $24,869 | $17,447 |
| 2024* | $25,381 | $18,590 |
| 2025* | $25,904 | $19,807 |