Lions: today = 32,000 (50, 32,000)
50 years ago = 100,000 (0, 100,000)

f (x) = ab^x
(0,100,000) implies a = 100,000
32,000 = 100,000b⁵⁰
b = 0.9774690152

f (x) = 100,000(0.977)^x