Economic Data Tidbit -- national surplus

The highest national surplus amounts as a % of GDP*

1. Brunei 56.0%
2. Kuwait 43.7%
3. Libya 38.6%
4. Macau 29.1%
5. Singapore 28.4%
6. Saudi Arabia 28.1
7. UAE 26.1%
8. Qatar 25.2%
9. Nigeria 24.5%
10. Trinidad & Tobago 24.3%

Any common threads here?

* From the Pocket World in Figures, 2008 Edition - The Economist