2014
0
500,000
1,000,000
1,500,000
2,000,000
2,500,000
3,000,000
3,500,000
4,000,000
1990
’92
’94
’96
’98
’00
’02
’04
’06
’08
’10
’12
2014
Note: 2014 production data is from the Pennsylvania Department of Environmental Protection and New York Department of Environmental Conservation.
