| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $29,256 | $18,446 |
| 2016 | $29,776 | $17,935 |
| 2017 | $30,281 | $19,435 |
| 2018 | $30,281 | $18,011 |
| 2019 | $31,364 | $20,416 |
| 2020 | $30,323 | $19,375 |
| 2021* | $30,838 | $18,838 |
| 2022* | $31,363 | $18,316 |
| 2023* | $31,896 | $17,809 |
| 2024* | $32,438 | $17,316 |
| 2025* | $32,990 | $16,836 |