$(2)$ arrives in one complete shipment, $(3)$ arrives undamaged, and $(4)$ is correctly billed. MountainMole has the following performance figures for the past four years.

Click the icon to view the performance table.

a$.$ Assuming that there is at most one error per order, calculate performance for each of the four years $($enter your responses rounded to two decimal places$).$

$2015,\%$

$2016,\%$

$2017,\%$

$2018,\%$