| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $35,565 | $21,873 |
| 2016 | $35,776 | $20,988 |
| 2017 | $35,426 | $19,012 |
| 2018 | $35,426 | $18,348 |
| 2019 | $37,827 | $18,778 |
| 2020 | $38,710 | $19,661 |
| 2021* | $38,938 | $18,975 |
| 2022* | $39,168 | $18,313 |
| 2023* | $39,399 | $17,673 |
| 2024* | $39,632 | $17,057 |
| 2025* | $39,865 | $16,461 |