| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $21,726 | $13,585 |
| 2016 | $22,266 | $14,717 |
| 2017 | $22,895 | $15,333 |
| 2018 | $22,895 | $14,448 |
| 2019 | $22,999 | $14,115 |
| 2020 | $23,381 | $14,497 |
| 2021* | $23,769 | $14,890 |
| 2022* | $24,164 | $15,293 |
| 2023* | $24,565 | $15,708 |
| 2024* | $24,973 | $16,134 |
| 2025* | $25,387 | $16,571 |
