| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $22,578 | $21,980 |
| 2016 | $22,839 | $18,859 |
| 2017 | $23,805 | N/A |
| 2018 | $23,805 | N/A |
| 2019 | $23,721 | $19,657 |
| 2020 | $23,943 | $19,879 |
| 2021* | $24,168 | $18,581 |
| 2022* | $24,395 | $17,368 |
| 2023* | $24,625 | $16,233 |
| 2024* | $24,856 | $15,173 |
| 2025* | $25,090 | $14,183 |