| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $16,035 | $9,606 |
| 2016 | $16,041 | $10,087 |
| 2017 | $16,349 | $10,393 |
| 2018 | $16,349 | $10,426 |
| 2019 | $16,855 | $10,253 |
| 2020 | $17,754 | $11,152 |
| 2021* | $18,095 | $11,490 |
| 2022* | $18,442 | $11,838 |
| 2023* | $18,796 | $12,197 |
| 2024* | $19,157 | $12,566 |
| 2025* | $19,525 | $12,947 |
