Go back further,  and it's even more striking: Since the 60s, the middle class has shrunk by 20 percent, mainly because of the people tumbling out of it.
더 거슬러 올라가면 훨씬 충격적입니다. 60년대부터 중산층은 20% 감소했어요. 주로 사람들이 중산층에서 떨어져나왔기 때문이죠.