He links directly to the source of that data and on that site you can download a CSV of the aggregated data.

  "iOS 13.3",27.03
  "iOS 12.4",16.19
  "iOS 12.3",14.2
  "iOS 13.1",10.22
  "iOS 12.2",7.89
  "iOS 12.1",4.16
  "iOS 13.4",4.02
  "iOS 13.2",2.68
  "iOS 10.3",2.31
  "iOS 11.4",2.14
  "iOS 9.3",1.94
  "iOS 11.2",1.03
  "iOS 12.0",0.86
  "iOS 13.0",0.82
  "iOS 11.0",0.81
  "iOS 11.3",0.72
  "iOS 6.0",0.45
  "iOS 10.2",0.4
  "iOS 11.1",0.32
  "iOS 7.1",0.18
  "iOS 13.5",0.17
  "iOS 10.1",0.17
  "iOS 9.1",0.15
  "iOS 7.0",0.15
  "iOS 10.0",0.14
  "iOS 6.1",0.13
  "iOS 5.1",0.12
  "iOS 9.2",0.12
  "iOS 8.4",0.11
  "iOS 8.1",0.1
  "iOS 8.3",0.06
  "iOS 9.0",0.06
  "iOS 5.0",0.04
  "iOS 8.0",0.03
  "iOS 4.3",0.03
  "iOS 8.2",0.02
  "iOS 3.2",0.01
  "Other",0.02