| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $19,620 | $13,547 |
| 2016 | $22,008 | $15,391 |
| 2017 | $23,028 | $16,217 |
| 2018 | $23,028 | $16,358 |
| 2019 | $24,488 | $17,579 |
| 2020 | $24,584 | $17,675 |
| 2021* | $25,722 | $18,624 |
| 2022* | $26,913 | $19,624 |
| 2023* | $28,159 | $20,678 |
| 2024* | $29,463 | $21,789 |
| 2025* | $30,827 | $22,959 |