| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $24,109 | $17,716 |
| 2016 | $24,246 | $17,000 |
| 2017 | $25,501 | $17,014 |
| 2018 | $25,501 | $16,422 |
| 2019 | $26,907 | $17,039 |
| 2020 | $26,214 | $16,346 |
| 2021* | $26,363 | $15,777 |
| 2022* | $26,514 | $15,228 |
| 2023* | $26,665 | $14,698 |
| 2024* | $26,817 | $14,187 |
| 2025* | $26,970 | $13,693 |