Why 12% of Fortune 500 companies survived from 1955?

Why 12% of Fortune 500 companies survived from 1955?

During the period of 1955 vs. 2017, only 60 Fortune companies survived. This is a significant change since 88% either bankrupt, merged or was acquired or did not make it to the list due to low revenues. So, when talking about constant change, this is a cruel reminder of economic forces driving fierce competition. Then, how does your company plan to not be in the 88% failure group?