| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $22,385 | $15,353 |
| 2016 | $22,397 | $15,035 |
| 2017 | $22,597 | $15,410 |
| 2018 | $22,597 | $15,908 |
| 2019 | $23,017 | $14,790 |
| 2020 | $22,984 | $14,757 |
| 2021* | $22,995 | $14,725 |
| 2022* | $23,007 | $14,692 |
| 2023* | $23,018 | $14,660 |
| 2024* | $23,030 | $14,628 |
| 2025* | $23,042 | $14,595 |