I want to know the answer to the following question:
During which time frame were most grandes ecoles relocated?
All the background I'm provided with is that "Most of the grandes écoles were relocated to the suburbs of Paris in the 1960s and 1970s, in new campuses much larger than the old campuses within the crowded city of Paris, though the École Normale Supérieure has remained on rue d'Ulm in the 5th arrondissement.". Is that enough to answer the question?
Answer: yes