Commodity20052006200720082010
Hydrogen $8,097  $8,471
Argon $17,987 $74,316$174,049
Rare gases other than argon $114,140$143,258 $205,321
Nitrogen$91,526$172,509$144,000$158,747$809,131
Oxygen    $342
Silicon, cont. by wt. not <99.99% of silicon $3,005  $6,757
Silicon, cont. by wt. <99.99% of silicon $16,446   
Arsenic $71,173   
Selenium$56,952$22,519   
Total$148,478$425,876$287,258$233,063$1,204,071