| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $14,904 | $9,090 |
| 2016 | $15,331 | $9,236 |
| 2017 | $15,891 | $9,211 |
| 2018 | $15,891 | $8,891 |
| 2019 | $16,162 | $7,993 |
| 2020 | $16,525 | $8,356 |
| 2021* | $16,897 | $8,333 |
| 2022* | $17,277 | $8,311 |
| 2023* | $17,666 | $8,288 |
| 2024* | $18,063 | $8,266 |
| 2025* | $18,470 | $8,244 |