| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $24,445 | $15,543 |
| 2016 | $24,390 | $16,424 |
| 2017 | $24,911 | $14,048 |
| 2018 | $24,911 | $18,633 |
| 2019 | $26,174 | $17,432 |
| 2020 | $27,737 | $18,995 |
| 2021* | $28,331 | $20,072 |
| 2022* | $28,937 | $21,210 |
| 2023* | $29,556 | $22,413 |
| 2024* | $30,189 | $23,684 |
| 2025* | $30,835 | $25,026 |