| Year | Total Expenses | Average Net Price |
|---|---|---|
| 2012 | $43,468 | $22,879 |
| 2013 | $44,900 | $24,311 |
| 2014 | $46,480 | $22,075 |
| 2015 | $47,840 | $23,435 |
| 2016 | $49,490 | $26,457 |
| 2017 | $50,820 | $25,418 |
| 2018* | $52,492 | $26,984 |
| 2019* | $54,219 | $28,646 |
| 2020* | $56,003 | $30,411 |
| 2021* | $57,845 | $32,284 |
| 2022* | $59,748 | $34,273 |
