How many countries have a population greater than one billion?
2
2
3
2
3
2
3
2
3
2
3
5
2
3
5
2
3
5
2
3
5
2
3
5
1
2
4
3
5
1
2
4
3
5
1
2
4
3
5
1
2
4
3
5
1
2
4
3
5
1
2
4
3
5
1
2
4
3
5
1
2
4
3
5
1
2
4
3
5
1
2
4
3
8
5
1
2
4
3
8
5
1
7
10
4
2 countries
8
5
1
7
10
4
8
5
1
6
7
10
4
11
8
5
1
6
7
10
4
11
8
5
3 countries
1
6
7
4 countries
10
4
11
8
1
6
7
10
4
11
8
1
6
7
10
4
11
8
1
6
2 countries
7
10
9
4
11
8
1
6
7
10
9
4
8 countries
11
8
5 countries
6
7
13
10
9
11
8
6
7
13
10
9
3 countries
11
10 countries
8
6 countries
4 countries
6
7
13
10
9
12
11
8
Three
6
7 countries
7
13
10
9
12
11
8
Three
11 countries
6
14
7
13
10
9
12
11
8
Three
2 countries