| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $22,071 | $17,500 |
| 2016 | $22,575 | $17,881 |
| 2017 | $22,635 | $17,325 |
| 2018 | $22,635 | $16,007 |
| 2019 | $23,307 | $13,377 |
| 2020 | $23,987 | $14,057 |
| 2021* | $24,534 | $13,620 |
| 2022* | $25,093 | $13,196 |
| 2023* | $25,665 | $12,786 |
| 2024* | $26,251 | $12,388 |
| 2025* | $26,849 | $12,003 |