| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $29,138 | $20,007 |
| 2016 | $30,170 | $21,106 |
| 2017 | $30,930 | $22,066 |
| 2018 | $30,930 | $22,027 |
| 2019 | $32,010 | $21,546 |
| 2020 | $32,498 | $22,034 |
| 2021* | $33,317 | $22,532 |
| 2022* | $34,157 | $23,041 |
| 2023* | $35,017 | $23,562 |
| 2024* | $35,900 | $24,094 |
| 2025* | $36,804 | $24,639 |