| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $18,703 | $15,026 |
| 2016 | $18,844 | $14,940 |
| 2017 | $19,079 | $15,271 |
| 2018 | $19,079 | $15,113 |
| 2019 | $19,616 | $15,354 |
| 2020 | $19,923 | $15,661 |
| 2021* | $20,172 | $15,910 |
| 2022* | $20,424 | $16,163 |
| 2023* | $20,679 | $16,420 |
| 2024* | $20,938 | $16,681 |
| 2025* | $21,200 | $16,946 |