| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $17,164 | $11,050 |
| 2016 | $17,654 | $10,714 |
| 2017 | $18,454 | $11,231 |
| 2018 | $18,454 | $10,653 |
| 2019 | $20,244 | $12,952 |
| 2020 | $22,544 | $15,252 |
| 2021* | $23,565 | $15,989 |
| 2022* | $24,633 | $16,761 |
| 2023* | $25,749 | $17,570 |
| 2024* | $26,915 | $18,419 |
| 2025* | $28,134 | $19,309 |