| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $16,635 | $12,020 |
| 2016 | $17,868 | $12,551 |
| 2017 | $18,324 | $12,285 |
| 2018 | $18,324 | $12,120 |
| 2019 | $19,198 | $12,638 |
| 2020 | $19,502 | $12,942 |
| 2021* | $19,999 | $13,254 |
| 2022* | $20,509 | $13,573 |
| 2023* | $21,032 | $13,900 |
| 2024* | $21,569 | $14,235 |
| 2025* | $22,119 | $14,579 |