I'm not in a position to give you details on climate adaptation programs and funding. However, we can provide you with that information. Environment and Climate Change Canada can provide you with an explanation.
Some federal government programs have a limited lifespan. That may be why you're seeing those figures. There's a normal cycle of program renewal, but I don't know if that's the case here. That is one possible reason, but I would like to give you a more definitive answer to your question later.