https://phys.org/news/2018-11-contrary-orangutans-decline.html

"All three species of orangutan are Critically Endangered and on a steep decline. Their numbers are not increasing as indicated by the Indonesian government report," says Erik Meijaard of Borneo Futures and the IUCN Species Survival Commission.

The Indonesian government's report focused on nine monitoring sites including national parks. Their data suggest the orangutan population doubled in one year, going from 1,153 orangutans in 2015 to 2,451 individuals in 2016.