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