Missing bags and compliants are ratios, not totals, so it is allready calculated that way.
I can see why you seem to be a company shill.
The point is the ratio is not the same for changing amounts of baggage, systemic constraints playing a large part in the ratio as volume increases, even capping and shuttering baggage throughput as happened in PHL several seasons ago. Your misunderstanding of such simple logic makes you a palin for incompetent management.
As the volume of baggage throughput decreases (time in system increases, increasing likelihood for "failure"), assuming the infrastructure does not change, the complaint ratio will always decrease faster than straight line assumptions, just as increasing the baggage volume will tend to increase problems faster than straight line. As the volume approaches system capacity, any amoeba should expect volatile results, even total system shutdown.
I simply pointed out that the environment changed, inducing passengers to not check baggage, resulting in less through put and the ratios should decrease as the now excess capacity can better handle the flow. That concept should cause anyone to question whether "increased worker enthusiasm" had anything to do with the lower number of "baggage" complaints.
You really should spend some time in the customs baggage claim area in PHL talking with US employees handling passenger complaints (the people on the floor). It might open your eyes to what is really going on, staffing numbers for containerized systems (76-330) used on non-containerized systems (75-73-ab) and how that slows and even stops the process. Not to mention the horrid compensation (less than MacDonalds). How hiring ex-cons (tax breaks?) results in more need to hire "security folks", resulting in a virtual prison system in the ramp/processing area.
Typically (for US) expensive exercise usually referred to as stepping over dollars to pick up pennies.