Well, there’s a reference point for New Yorkers to hang their hopes on. “In the ’60s and ’70s, people left in much, much greater numbers than anything that’s being talked about right now,” Mayor Bill de Blasio said Wednesday in dismissing a reporter’s question about New Yorkers fleeing the Big Apple from a combination of the coronavirus pandemic, crime wave and cratering economy. Between 1970 and 1980, over 1 million more people moved out of the city than into it, according to the census bureau. It was the largest population decline in the history of the Big Apple. Hizzoner also blamed the media for “painting a picture that’s not true.”