grade
country
Output (million tons)
Share (%)
1
Saudi Arabia
5 14.6
13. 1
2
Russia
480.5
12.3
three
United States of America
3 1 1.8
eight
four
Iran
209.8
5.4
five
China
183.7
4.7
six
Mexico
183. 1
4.7
seven
Canada
15 1.3
3.9
eight
Venezuela
145. 1
3.7
nine
The United Arab Emirates
138.3
3.5
10
Kuwait
133.2
3.4