| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2015 | $28,656 | $24,217 |
| 2016 | $29,408 | $24,884 |
| 2017 | $30,264 | $26,082 |
| 2018 | $30,264 | $26,467 |
| 2019 | $33,168 | $31,502 |
| 2020 | $35,622 | $33,956 |
| 2021* | $36,659 | $35,589 |
| 2022* | $37,725 | $37,301 |
| 2023* | $38,823 | $39,095 |
| 2024* | $39,953 | $40,976 |
| 2025* | $41,116 | $42,947 |