| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $18,702 | $11,791 |
| 2016 | $19,518 | $12,606 |
| 2017 | $19,933 | $12,663 |
| 2018 | $19,933 | $12,452 |
| 2019 | $21,801 | $13,457 |
| 2020 | $22,563 | $14,219 |
| 2021* | $23,353 | $15,024 |
| 2022* | $24,170 | $15,874 |
| 2023* | $25,016 | $16,773 |
| 2024* | $25,892 | $17,722 |
| 2025* | $26,798 | $18,725 |