| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $21,782 | $13,521 |
| 2016 | $22,228 | $13,500 |
| 2017 | $22,722 | $14,130 |
| 2018 | $22,722 | $14,115 |
| 2019 | $23,518 | $14,686 |
| 2020 | $24,014 | $15,182 |
| 2021* | $24,521 | $15,695 |
| 2022* | $25,038 | $16,226 |
| 2023* | $25,566 | $16,774 |
| 2024* | $26,106 | $17,341 |
| 2025* | $26,657 | $17,927 |