| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $21,231 | $14,097 |
| 2016 | $21,640 | $15,173 |
| 2017 | $22,952 | $16,189 |
| 2018 | $22,952 | $16,075 |
| 2019 | $24,612 | $17,265 |
| 2020 | $25,388 | $18,041 |
| 2021* | $26,188 | $19,250 |
| 2022* | $27,013 | $20,539 |
| 2023* | $27,864 | $21,916 |
| 2024* | $28,741 | $23,384 |
| 2025* | $29,647 | $24,951 |