| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $22,493 | $13,803 |
| 2016 | $23,163 | $15,286 |
| 2017 | $23,363 | $14,838 |
| 2018 | $23,363 | $14,696 |
| 2019 | $24,358 | $14,948 |
| 2020 | $24,112 | $14,702 |
| 2021* | $24,319 | $14,561 |
| 2022* | $24,529 | $14,421 |
| 2023* | $24,739 | $14,283 |
| 2024* | $24,952 | $14,146 |
| 2025* | $25,167 | $14,010 |