| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $21,068 | $13,948 |
| 2016 | $21,545 | $13,978 |
| 2017 | $21,920 | $14,027 |
| 2018 | $21,920 | $15,185 |
| 2019 | $23,538 | $15,075 |
| 2020 | $23,734 | $15,271 |
| 2021* | $24,147 | $15,324 |
| 2022* | $24,567 | $15,378 |
| 2023* | $24,995 | $15,432 |
| 2024* | $25,430 | $15,486 |
| 2025* | $25,872 | $15,540 |