Answer
2,500 plants
Work Step by Step
The green bar for the March 2012 rises to 6, and Multiply 6 by 1000 because the label on the left side of the graph says in thousands 6,000. So, in the March 2012, there were 6,000 plants shipped.
The blue bar for the March 2013 rises to 8.5, and Multiply 8.5 by 1000 because the label on the left side of the graph says in thousands 8,500. So, in the March 2013, there were 8,500 plants shipped.
To find how many fewer plants were shipped in March of 2012 than in March of 2013= 8,500 - 6000 = 2,500 plants.