| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $17,352 | $13,218 |
| 2016 | $17,507 | $13,163 |
| 2017 | $17,978 | $14,141 |
| 2018 | $17,978 | $13,863 |
| 2019 | $19,924 | $14,783 |
| 2020 | $20,308 | $15,167 |
| 2021* | $20,700 | $15,561 |
| 2022* | $21,099 | $15,966 |
| 2023* | $21,507 | $16,381 |
| 2024* | $21,922 | $16,807 |
| 2025* | $22,345 | $17,244 |
