| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,296 | $15,107 |
| 2016 | $20,482 | $15,055 |
| 2017 | $21,062 | $15,547 |
| 2018 | $21,062 | $15,582 |
| 2019 | $21,859 | $16,040 |
| 2020 | $22,720 | $16,901 |
| 2021* | $23,363 | $17,398 |
| 2022* | $24,024 | $17,909 |
| 2023* | $24,704 | $18,436 |
| 2024* | $25,403 | $18,978 |
| 2025* | $26,122 | $19,536 |