A plain look at what changed, and what it means from here.
Most people meet this once and never think about it again, which is exactly why it is worth reading up on.
What it costs
There is a deadline involved, and missing it costs more than the difference. The figures move about, but the direction has been the same for three years.
What to check first
The figures move about, but the direction has been the same for three years. Nobody is required to explain this to you, which is half the problem.
The short answer: check the date, then check the figure, then decide.