| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $20,739 | $14,351 |
| 2016 | $21,089 | $14,881 |
| 2017 | $21,414 | $15,060 |
| 2018 | $21,414 | $13,703 |
| 2019 | $22,068 | $13,993 |
| 2020 | $22,551 | $14,476 |
| 2021* | $22,932 | $14,783 |
| 2022* | $23,320 | $15,096 |
| 2023* | $23,714 | $15,416 |
| 2024* | $24,115 | $15,743 |
| 2025* | $24,522 | $16,077 |