| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $18,870 | $13,869 |
| 2016 | $20,080 | $15,111 |
| 2017 | $19,790 | $15,572 |
| 2018 | $19,790 | $14,619 |
| 2019 | $20,650 | $14,670 |
| 2020 | $20,870 | $14,890 |
| 2021* | $21,093 | $15,113 |
| 2022* | $21,319 | $15,340 |
| 2023* | $21,547 | $15,570 |
| 2024* | $21,778 | $15,804 |
| 2025* | $22,011 | $16,041 |