What part of the green onion do you use?

the green part 1 (9%)
the white part 2 (18%)
a little green, a little white 1 (9%)
the whole thing 7 (68%)

Whenever I use a green onion for cooking I'm never certain what portion of it to use. I usually end up using all of the white and most of the green-so I guess the whole thing. Just was curious.