| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,640 | $15,080 |
| 2016 | $21,000 | $15,232 |
| 2017 | $21,360 | $15,292 |
| 2018 | $21,360 | $15,635 |
| 2019 | $21,620 | $15,517 |
| 2020 | $22,260 | $16,157 |
| 2021* | $22,641 | $16,320 |
| 2022* | $23,028 | $16,485 |
| 2023* | $23,422 | $16,652 |
| 2024* | $23,822 | $16,820 |
| 2025* | $24,229 | $16,990 |