| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $19,293 | $15,452 |
| 2016 | $19,539 | $15,905 |
| 2017 | $19,720 | $16,194 |
| 2018 | $19,720 | $16,267 |
| 2019 | $20,031 | $16,163 |
| 2020 | $20,622 | $16,754 |
| 2021* | $20,886 | $17,059 |
| 2022* | $21,153 | $17,369 |
| 2023* | $21,424 | $17,686 |
| 2024* | $21,698 | $18,007 |
| 2025* | $21,976 | $18,335 |