| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $24,401 | $18,215 |
| 2016 | $24,614 | $19,585 |
| 2017 | $27,031 | $22,011 |
| 2018 | $27,031 | $22,024 |
| 2019 | $28,306 | $22,843 |
| 2020 | $28,504 | $23,041 |
| 2021* | $28,752 | $23,898 |
| 2022* | $29,002 | $24,787 |
| 2023* | $29,254 | $25,709 |
| 2024* | $29,509 | $26,666 |
| 2025* | $29,766 | $27,658 |