| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $21,770 | $16,372 |
| 2016 | $21,950 | $16,853 |
| 2017 | $25,283 | $20,078 |
| 2018 | $25,283 | $20,309 |
| 2019 | $25,810 | $20,425 |
| 2020 | $26,769 | $21,384 |
| 2021* | $27,326 | $22,013 |
| 2022* | $27,894 | $22,660 |
| 2023* | $28,474 | $23,326 |
| 2024* | $29,067 | $24,012 |
| 2025* | $29,671 | $24,718 |