| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,299 | $15,968 |
| 2016 | $22,970 | $18,910 |
| 2017 | $23,690 | $19,896 |
| 2018 | $23,690 | $19,844 |
| 2019 | $25,984 | $21,644 |
| 2020 | $26,622 | $22,282 |
| 2021* | $27,455 | $23,443 |
| 2022* | $28,315 | $24,664 |
| 2023* | $29,201 | $25,949 |
| 2024* | $30,115 | $27,301 |
| 2025* | $31,057 | $28,724 |