Q: Context: The Louvre Pyramid (Pyramide du Louvre) is a large glass and metal pyramid designed by Chinese-American architect I.M. Pei, surrounded by three smaller pyramids, in the main courtyard (Cour Napoleon) of the Louvre Palace (Palais du Louvre) in Paris. The large pyramid serves as the main entrance to the Louvre Museum. Completed in 1989, it has become a landmark of the city of Paris.

Question: when was the glass pyramid at the louvre built? Let's give stream of consciousness first:
The relevant sentence in the passage is: Completed in 1989, it has become a landmark of the city of Paris. Therefore, the final answer is 1989.