Is there a graph showing changes in kangaroo populations in Australia?

No such graphs exist. Kangaroo populations fluctuate widely with the seasons, with droughts and floods. It should be remembered also that there are over 60 species of kangaroos in Australia, and populations of each species vary.

Data for the Red Kangaroo and Grey Kangaroo in just one region of New South Wales are available at the related link below, but it is not available in a graph. It is a trend that would be repeated in many places around Australia, but which would vary greatly with the states and the season.
No such graphs exist. Kangaroo populations fluctuate widely with the seasons, with droughts and floods. It should be remembered also that there are over 60 species of kangaroos in Australia, and populations of each species vary.

Data for the Red Kangaroo and Grey Kangaroo in just one region of New South Wales are available at the related link below, but it is not available in a graph. It is a trend that would be repeated in many places around Australia, but which would vary greatly with the states and the season.