The "nominal" line is manufacturing value added as a share of GDP. The "real" line is equal to the nominal line multiplied by the cumulative change since 2000 in the price index for GDP divided by the price index for manufacturing.
2015
0
5
10
15
20
25
27.90
1950
’55
’60
’65
’70
’75
’80
’85
’90
’95
’00
’05
’10
2015
Real
Nominal
Brad DeLong's calculations from standard data from the Department of Commerce's Bureau of Economic Analysis
