| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,920 | $11,476 |
| 2016 | $22,352 | $12,564 |
| 2017 | $23,010 | $13,426 |
| 2018 | $23,010 | $13,827 |
| 2019 | $24,321 | $15,415 |
| 2020 | $23,760 | $14,854 |
| 2021* | $24,459 | $15,873 |
| 2022* | $25,178 | $16,962 |
| 2023* | $25,918 | $18,125 |
| 2024* | $26,680 | $19,369 |
| 2025* | $27,464 | $20,698 |