Here is the explanation from Google, I just changed the terms to bitcoin, as I searched for bitcoin:
See in which location bitcoin was most popular during the specified time frame. Values are calculated on a scale from 0 to 100, where 100 is the location with the most popularity as a fraction of total searches in that location, a value of 50 indicates a location which is half as popular. A value of 0 indicates a location where there was not enough data for this term.
Note: A higher value means a higher proportion of all queries, not a higher absolute query count. So a tiny country where 80% of the queries are for "bitcoin" will get twice the score of a giant country where only 40% of the queries are for "bitcoin."
This statistic is for the past 12 months, and I am not really amazed that most bitcoin searches came from Nigeria. However, I would think Venezuela would be on the top 5 as well. I don't understand why Austria was above Switzerland, but oh well. I imagine South Korea is in 58 because they are searching for altcoins or something.
So what do you think about this ranking? Here is the complete order:
Rank
Country, Percentage
1
Nigeria, 100
2
South Africa, 69
3
Austria, 59
4
Ghana, 59
5
Switzerland, 54
6
Netherlands, 54
7
St. Helena, 52
8
Germany, 44
9
Singapore, 42
10
Australia, 41
11
Ireland, 39
12
Brazil, 38
13
Slovenia, 38
14
Canada, 36
15
Malaysia, 36
16
Venezuela, 35
17
United Arab Emirates, 35
18
United States, 32
19
United Kingdom, 31
20
New Zealand, 31
21
Turkey, 30
22
Pakistan, 29
23
Portugal, 28
24
Philippines, 28
25
Belgium, 27
26
Norway, 25
27
Sweden, 25
28
Hong Kong, 25
29
Colombia, 24
30
Kenya, 24
31
Spain, 23
32
Czechia, 23
33
Lithuania, 23
34
Croatia, 23
35
Italy, 21
36
Finland, 21
37
Bulgaria, 19
38
Romania, 19
39
Israel, 18
40
Slovakia, 18
41
Denmark, 18
42
Vietnam, 17
43
Poland, 16
44
Peru, 16
45
Serbia, 15
46
Indonesia, 15
47
France, 15
48
Argentina, 14
49
Bangladesh, 14
50
Morocco, 14
51
Iran, 14
52
Hungary, 13
53
India, 13
54
Thailand, 13
55
Mexico, 12
56
Greece, 12
57
Chile, 12
58
South Korea, 9
59
Egypt, 8
60
Saudi Arabia, 8
61
Ukraine, 6
62
Russia, 5
63
Taiwan, 4
64
Japan, 2