What is the total production of units C, D and E together for both the years? (in Million tons)

As we can see in the graph that
Total production by unit C, D and E in year 2001 and 2002 together = (100 + 110 + 95 + 100 + 85 + 105 )
Required total production = (100 + 110 + 95 + 100 + 85 + 105) = 595 Million tons.