| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $22,182 | $15,076 |
| 2016 | $22,042 | $14,788 |
| 2017 | $22,447 | $15,189 |
| 2018 | $22,447 | $14,530 |
| 2019 | $23,233 | $14,885 |
| 2020 | $23,440 | $15,092 |
| 2021* | $23,649 | $15,302 |
| 2022* | $23,859 | $15,514 |
| 2023* | $24,071 | $15,730 |
| 2024* | $24,286 | $15,949 |
| 2025* | $24,502 | $16,170 |