| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $19,893 | $14,971 |
| 2016 | $19,991 | $13,563 |
| 2017 | $20,529 | $13,806 |
| 2018 | $20,529 | $13,410 |
| 2019 | $21,519 | $14,042 |
| 2020 | $21,669 | $14,192 |
| 2021* | $21,821 | $14,344 |
| 2022* | $21,973 | $14,497 |
| 2023* | $22,127 | $14,652 |
| 2024* | $22,282 | $14,809 |
| 2025* | $22,438 | $14,968 |