Russia
12,000
in 2010
7,290
in 2016
US
9,600
7,000
France
China
UK
300
260
215
Pakistan
India
Israel
North
Korea
10
130
120
80
12,000
in 2010
9,600
7,290
in 2016
7,000
Russia
US
300
260
215
130
120
80
10
France
China
UK
Pakistan
India
Israel
North Korea