| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $17,986 | $13,524 |
| 2016 | $17,690 | $13,057 |
| 2017 | $17,641 | $12,721 |
| 2018 | $17,641 | $12,806 |
| 2019 | $20,616 | $14,897 |
| 2020 | $18,911 | $13,192 |
| 2021* | $18,858 | $12,853 |
| 2022* | $18,805 | $12,523 |
| 2023* | $18,753 | $12,201 |
| 2024* | $18,700 | $11,887 |
| 2025* | $18,648 | $11,582 |
