When the value world rank 7, what the rank one?
Rank Commodity Value (Int $1000) Production (MT) Quantity world rank Value world rank
real text real real text text
1-21109892-1
1 Wheat 939150 6400000 19 17
2 Indigenous chicken meat 635889 446424 NA NA
3 Olives 616541 770000 6 6
4 Tomatoes 480433 1300000 17 17
5 Indigenous cattle meat 433257 160384 NA NA
6 Cow milk, whole, fresh 409566 1750000 NA NA
7 Barley 389709 3800000 12 7
8 Indigenous sheep meat 325935 119706 NA NA
9 Almonds, with shell 307240 104115 5 5
10 Oranges 231910 1200000 14 14
11 Potatoes 230032 1500000 NA NA
12 Hen eggs, in shell 221668 267267 NA NA
13 String beans 173716 182180 3 3
14 Grapes 171485 300000 NA NA
15 Apples 169166 400000 NA NA
16 Strawberries 168627 124239 11 11
17 Onions, dry 136521 650000 23 23
18 Other melons (inc.cantaloupes) 134386 730000 8 8
19 Tangerines, mandarins, clem. 128945 522000 12 12
table_21109892_1
SELECT Rank FROM table WHERE Value world rank = 7
7