Getting a specific Google Analytics sequence

I am trying to get the specific meaning of the stages of the goal. But I can only get With Expolorer API

startGoal and Go Completed (Look at the picture I attached to understand what I can’t get) Using

ha: goal1Start

I can get the number: 15 963 (Look at the picture attached to the understanding)

and with

GA: goal1Completions

I can get the number: 31 (Look at the picture I understood)

How can I get the average floors for goals with a value of 156? Is it possible?

Api Explorer: https://developers.google.com/apis-explorer/#p/analytics/v3/analytics.data.ga.get?ids=ga%253A68044380&start-date=2013-02-20&end-date=2013-02-20&metrics=ga%253Agoal1Starts%252C+ga%253Agoal1Completions&_h=24&!