A blood test for diabetes gives a positive result with a proportion of $0\mathrm{.}31$ when an individual has diabetes and a negative result with a proportion of $0\mathrm{.}96$ when they do not. Approximately a proportion of $0\mathrm{.}75$ of the population has diabetes. If a randomly chosen citizen tested negative, what is the probability that they actually have diabetes? Round your answer to five decimals.