| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $19,106 | $14,415 |
| 2016 | $19,420 | $14,576 |
| 2017 | $20,226 | $15,305 |
| 2018 | $20,226 | $15,118 |
| 2019 | $21,278 | $15,741 |
| 2020 | $21,664 | $16,127 |
| 2021* | $22,056 | $16,522 |
| 2022* | $22,455 | $16,927 |
| 2023* | $22,862 | $17,342 |
| 2024* | $23,276 | $17,766 |
| 2025* | $23,697 | $18,202 |