Biggest GDP
1.United Vanjanan Empire(83b)
2.Lydiah(73b)
3.Numberg(70b)
4.Lance Empire(69b)
5.The Glorious Republic of New Drakran(66b)
6.The Empire of Corustaria(65b)
7.Azor(60b)

I just went and made a ranking of Highest GDPs.