When the countries' GDP is measured at purchasing power parity (PPP) rates, all 19 members are among the top 30 in the world for the year of 2017, according to the IMF. Iran (18), Thailand (20), Egypt (21), Taiwan (22), Nigeria (24), Pakistan (25), Malaysia (26) and Philippines (29) are not G20 members, while Poland (23) and the Netherlands (28) are only included by virtue of being EU members, and Spain (15), is a permanent guest invitee. However, in a list of average GDP, calculated for the years since the group's creation (1999–2008) at both nominal and PPP rates, only Spain, the Netherlands, Nigeria, Poland, Taiwan, Iran and Thailand appear above any G20 member in both lists simultaneously.