| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $21,078 | $15,163 |
| 2016 | $21,215 | $15,525 |
| 2017 | $21,353 | $18,075 |
| 2018 | $21,353 | $15,766 |
| 2019 | $22,177 | $17,661 |
| 2020 | $22,450 | $17,934 |
| 2021* | $22,596 | $18,363 |
| 2022* | $22,743 | $18,801 |
| 2023* | $22,891 | $19,251 |
| 2024* | $23,039 | $19,711 |
| 2025* | $23,189 | $20,182 |