After estimating a trend model for annual time-series data, you obtain the following residual plot against time: 
The problem with your model is that
Definitions:
Less Prone
Having a reduced likelihood or susceptibility to something.
Prisoner's Dilemma Game
A concept in game theory where two individuals acting in their own self-interest do not produce the optimal outcome for either party.
Mutual Cooperation
Refers to the process where individuals or entities work together towards a common goal, ensuring mutual benefit.
Hear Each Other
The process of actively listening and being attentive to what someone else is saying, acknowledging their perspective.
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