Are Pashtuns really the majority in so-called country Afghanistan?

Pashtun sources including those who are in the government claim that Pashtuns are the majority (40% to 60%) of the population in so-called country Afghanistan. But non-Pashtun say that Pashtuns are between 20% to 30%. In fact, there is no any reliable statistic nor national census to say who are majorities, and who are minorities.