What year was the Berlin Airport the busiest?

What are equivilent ratios? What valve controls the flow of blood from the ventricles to the bodys main artery? Is cramping of the uterus at 5 weeks pregnant caused by expanding? ZIP code Pakistan? Did pink sing you kissed a girl? How many songs do the omg girlz have? Why was the Apostles' Creed changed? Consider a triangle with side lengths a and b and hypotenuse length c If then the converse of the Pythagorean theorem says that the triangle is a right triangle? How old is Lee Carter? What are the complementary bases of a t g c c c t a t a g c g c g c a a a g a g? What is Shakira's skype name? How do you say Happy Halloween to all in Portuguese? Can domestic house cats see in color? How is density calculated from measured data? What is the land area US in acres? What type of threat do trawlers pose to the ocean? What government agency regulates the sea worthiness of marine vessels? In The Fairly Odd Parents why did Vicky bully Timmy? What does one man's ceiling is another man's floor mean? What was the plot of the story Meeting by consorcio borje?

What year was the Berlin Airport the busiest?