| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $25,992 | $19,766 |
| 2016 | $25,826 | $21,017 |
| 2017 | $27,530 | $22,167 |
| 2018 | $27,530 | $21,968 |
| 2019 | $29,490 | $22,898 |
| 2020 | $29,827 | $23,235 |
| 2021* | $30,167 | $24,218 |
| 2022* | $30,511 | $25,242 |
| 2023* | $30,859 | $26,310 |
| 2024* | $31,211 | $27,423 |
| 2025* | $31,566 | $28,583 |