How many countries were originally in NATO?
12
3
4
3
5
4
3
5
4
3
5
4
3
5
4
3
5
4
3
5
4
6
3
5
4
6
3
5
4
6
3
5
7
4
6
3
5
7
1
4
6
3
5
7
1
2
4
6
3
5
7
1
2
4
6
3
5
13
7
1
2
4
6
3
5
13
7
1
2
4
6
3
5
13
12
7
1
2
4
6
3
5
13
12
7
1
2
4
6
10
3
5
13
12
7
1
2
4
6
10
3
8
5
13
11
12
7
1
2
4
6
10
3
8
5
13
11
12
7
1
2
4
6
14
10
8
28
5
13
11
12
7
1
2
6
14
10
8
28
13
11
12
7
1
2
9
6
14
10
8
28
13
11
12
7
1
67
2
9
6
27
14
10
8
28
13
11
12
7
1
2
9
6
27
14
10
8
28
13
77
11
12
7
1
2
9
6
27
14
10
8
28
13
11
12
66
76
58
0
71
68