In a certain population, a genetic disorder affects 1 in every 1000 individuals. A diagnostic test has been developed to detect the disorder, and studies have shown that the test correctly identifies individuals with the disorder 80% of the time (sensitivity). However, the test also incorrectly identifies individuals without the disorder as having it 30% of the time (false positive rate). If a randomly selected individual tests negative for the disorder, what is the probability that they actually have the disorder?