| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $25,169 | $17,660 |
| 2016 | $25,816 | $18,458 |
| 2017 | $26,862 | $19,082 |
| 2018 | $26,862 | $18,200 |
| 2019 | $28,764 | $18,818 |
| 2020 | $29,791 | $19,845 |
| 2021* | $30,855 | $20,520 |
| 2022* | $31,956 | $21,217 |
| 2023* | $33,097 | $21,939 |
| 2024* | $34,278 | $22,685 |
| 2025* | $35,502 | $23,456 |