| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $22,304 | $13,591 |
| 2016 | $22,830 | $13,801 |
| 2017 | $23,492 | $14,934 |
| 2018 | $23,492 | $14,410 |
| 2019 | $23,959 | $14,190 |
| 2020 | $25,655 | $15,886 |
| 2021* | $26,260 | $16,132 |
| 2022* | $26,880 | $16,382 |
| 2023* | $27,515 | $16,636 |
| 2024* | $28,164 | $16,894 |
| 2025* | $28,829 | $17,156 |