C1. Decline.

An observed, estimated or projected continuing decline of at least (up to a max. of 100 years in future): 25% in 3 years or 1 generation (whichever is longer) = CR. 20 % in 5 years or 2 generations (whichever is longer) = EN. 10% in 10 years of 3 generations (whichever is longer) = VU.