| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $25,504 | $16,013 |
| 2016 | $26,104 | $18,271 |
| 2017 | $26,854 | $17,393 |
| 2018 | $26,854 | $19,099 |
| 2019 | $27,754 | $17,807 |
| 2020 | $28,204 | $18,257 |
| 2021* | $28,867 | $18,719 |
| 2022* | $29,545 | $19,192 |
| 2023* | $30,239 | $19,678 |
| 2024* | $30,950 | $20,176 |
| 2025* | $31,677 | $20,686 |