| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $19,857 | $15,735 |
| 2016 | $20,025 | $15,468 |
| 2017 | $21,057 | $16,991 |
| 2018 | $21,057 | $16,509 |
| 2019 | $21,291 | $15,268 |
| 2020 | $21,327 | $15,304 |
| 2021* | $21,508 | $15,044 |
| 2022* | $21,691 | $14,788 |
| 2023* | $21,875 | $14,537 |
| 2024* | $22,061 | $14,290 |
| 2025* | $22,249 | $14,047 |