| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,083 | $17,016 |
| 2016 | $23,394 | $15,936 |
| 2017 | $24,113 | $15,860 |
| 2018 | $24,113 | $15,410 |
| 2019 | $25,257 | $15,219 |
| 2020 | $25,644 | $15,606 |
| 2021* | $26,036 | $15,412 |
| 2022* | $26,435 | $15,221 |
| 2023* | $26,839 | $15,033 |
| 2024* | $27,250 | $14,846 |
| 2025* | $27,667 | $14,662 |