| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $22,532 | $16,060 |
| 2016 | $23,618 | $15,495 |
| 2017 | $24,067 | $15,462 |
| 2018 | $24,067 | $16,359 |
| 2019 | $25,459 | $16,926 |
| 2020 | $25,676 | $17,143 |
| 2021* | $26,164 | $17,362 |
| 2022* | $26,661 | $17,585 |
| 2023* | $27,168 | $17,810 |
| 2024* | $27,684 | $18,038 |
| 2025* | $28,210 | $18,269 |