| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $23,077 | $13,510 |
| 2016 | $23,730 | $14,373 |
| 2017 | $22,717 | $13,739 |
| 2018 | $22,717 | $14,388 |
| 2019 | $24,198 | $16,383 |
| 2020 | $25,983 | $18,168 |
| 2021* | $26,718 | $19,329 |
| 2022* | $27,474 | $20,564 |
| 2023* | $28,252 | $21,878 |
| 2024* | $29,052 | $23,276 |
| 2025* | $29,874 | $24,763 |