| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $28,576 | $20,932 |
| 2016 | $28,868 | $20,838 |
| 2017 | $29,546 | $21,814 |
| 2018 | $29,546 | $22,138 |
| 2019 | $30,494 | $21,532 |
| 2020 | $30,886 | $21,924 |
| 2021* | $31,284 | $22,251 |
| 2022* | $31,688 | $22,582 |
| 2023* | $32,097 | $22,919 |
| 2024* | $32,511 | $23,260 |
| 2025* | $32,930 | $23,607 |