| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $29,544 | $26,654 |
| 2016 | $29,004 | $25,072 |
| 2017 | $28,626 | $24,075 |
| 2018 | $28,626 | $24,595 |
| 2019 | $28,284 | $24,176 |
| 2020 | $25,041 | $20,933 |
| 2021* | $24,715 | $20,100 |
| 2022* | $24,394 | $19,300 |
| 2023* | $24,077 | $18,532 |
| 2024* | $23,764 | $17,794 |
| 2025* | $23,455 | $17,086 |
