For the last 5-10 years certain COs have mentioned donations being low on a congregational level.
One measure of health sometimes used is to review the amount of literature received by the congregation and the amount of money donated for the worldwide work. Doing that, many congregations have found that they don't even donate enough to cover the basic literature they are receiving much less extra or money from anyone they meet in the field ministry.
Congregations can do this analysis using the old costs of similar or same literature or they can just state that they receive the same literature as when prices were charged and compare the amount of donations. Either way congregations keep coming up short.
The problem I see is that the WTS keeps doing separate requests for money. For example, the circuit overseer car insurance fund or special money to build a local assembly hall, etc etc. The friends may respond to this specific request but the money comes from somewhere - that somewhere is usually the general worldwide work fund.
If you're still active in a congregation try asking the secretary if the congregation contributes as much as it used to for the literature that it receives. Of course, they may not like you nosing around about it. You know, Jehovah will take care of it.