| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,202 | $17,983 |
| 2016 | $23,778 | $19,361 |
| 2017 | $23,877 | $20,025 |
| 2018 | $23,877 | $19,189 |
| 2019 | $24,489 | $18,452 |
| 2020 | $25,081 | $19,044 |
| 2021* | $25,688 | $19,655 |
| 2022* | $26,310 | $20,286 |
| 2023* | $26,946 | $20,937 |
| 2024* | $27,598 | $21,610 |
| 2025* | $28,266 | $22,303 |