Delphi 1 = 10
Delphi 2 = 20
Delphi 3 = 30
Delphi 4 = 40
Delphi 5 = 50
Delphi 6 = 60
Delphi 7 = 70
Delphi 2005 = 90
Delphi 2006 = 100
Delphi 2007 = 110
Delphi 2009 = 120
Delphi 2010 = 140
Delphi XE = 150
Delphi XE2 = 160
Delphi XE3 = 170
Delphi XE4 = 180
Delphi XE5 = 190
Delphi XE6 = 200
Delphi XE7 = 210
Delphi XE8 = 220
Delphi 10 Seattle = 230
Delphi 10.1 Berlin = 240
Delphi 10.2 Tokyo = 250

Delphi 10.3 Rio = 260
Delphi 10.4 Sydney = 270

Delphi 11 = 280
Delphi 12 = 290
Delphi 13 = 370

Yes, that's right, this time Embarcadero decided to skip a few library version numbers, to get the library version number in sync with the compiler version number. For reference, the compiler version number was previously counted up from the version numbers, all the way back the Turbo Pascal. The Library version numbers, on the other hand, started with Delphi 1.0, which was iteration 8 of the compiler, but the first release with a RTL and VCL.