The document contains a line graph showing two data series over time from 1929 to 2009. One data series appears to be labeled "EXPGSA" and shows values ranging from approximately -400 to 2400 over the 80-year period. The graph lacks labels for the axes or a legend, so the specific data and its units being graphed cannot be determined from the image alone.

2. -400.0
0.0
400.0
800.0
1200.0
1600.0
2000.0
2400.0
1929 1939 1949 1959 1969 1979 1989 1999 2009
EXPGSA
EXPGSA