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Proof of what I have noticed:

(from "IQ and the Wealth of Nations" Richard Lynn, Tatu Vanhanen Praeger, ISBN 027597510X)
2002 [Tatu Vanhanen Praeger is the father of the Finnish Prime Minister]

Country	IQ estimate
Hong Kong	107
South Korea	106
Japan	105
Taiwan (ROC)	104
Singapore	104
Austria	102
Germany	102
Italy	102
Netherlands	102
Sweden	101
Switzerland	101
Belgium	100
China (PRC)	100
New Zealand	100
United Kingdom	100
Hungary	99
Poland	99
Spain	99
Australia	98
Denmark	98
France	98
Norway	98
United States	98
Canada	97
Czech Republic	97
Finland	97
Argentina	96
Russia	96
Slovakia	96
Uruguay	96
Portugal	95
Slovenia	95
Israel	94
Romania	94
Bulgaria	93
Ireland	93
Greece	92
Malaysia	92
Thailand	91
Croatia	90
Peru	90

Country	IQ estimate
Turkey	90
Colombia	89
Indonesia	89
Suriname	89
Colombia	88
Brazil	87
Iraq	87
Mexico	87
Samoa	87
Tonga	87
Lebanon	86
Philippines	86
Cuba	85
Morocco	85
Fiji	84
Iran	84
Marshall Islands	84
Puerto Rico	84
Egypt	83
India	81
Ecuador	80
Guatemala	79
Barbados	78
Nepal	78
Qatar	78
Zambia	77
Congo-Brazzaville	73
Uganda	73
Jamaica	72
Kenya	72
South Africa	72
Sudan	72
Tanzania	72
Ghana	71
Nigeria	67
Zimbabwe	66
Congo-Kinshasa	65
Sierra Leone	64
Ethiopia	63
Equatorial Guinea	59

My information comes from first hand experience in Cameroon, Ivory Coast, Togo, Senegal, Chad, Nigeria and Egypt. I found this abstract only now. This chart corroborates what I have witnessed first-hand.