| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $22,482 | $15,086 |
| 2016 | $21,908 | $14,842 |
| 2017 | $22,601 | $14,852 |
| 2018 | $22,601 | $15,505 |
| 2019 | $24,732 | $17,667 |
| 2020 | $26,053 | $18,988 |
| 2021* | $26,876 | $19,823 |
| 2022* | $27,726 | $20,696 |
| 2023* | $28,602 | $21,606 |
| 2024* | $29,506 | $22,557 |
| 2025* | $30,438 | $23,550 |