Asthma rates falling but eczema and hay fever stand still. What does this tell us about allergies?

You might have thought that health specialists would closely monitor the prevalence of allergies in the population, especially when they are far more common than they used to be. In fact, it happens less than you would think. For asthma, for example, the government publishes statistics on the numbers of people that are admitted to hospital or die from the condition, but it does not publish a running total of how many people are affected overall.