• What is the horizontal scale of your graph?  How many years does it show?
• It shows from 1880 all the way to 2000
• What is the vertical axis showing?  What are the units?  What is the total range shown?
• From -0.6 up to .06 and the total range shown is 1.2.
• Can you tell from the picture's host page where the data came from?  If so, where?
• It didn't tell me where the data came from.