Study the following graph and answer the question. 

In which year was the value per tonne the minimum?

From the graph, 

Value per tonne for the year 2005 = $$\frac{150}{100\times100000}=\frac{1.5}{100000}$$ crore/tonne

Value per tonne for the year 2006 = $$\frac{150}{75\times100000}=\frac{2}{100000}$$ crore/tonne

Value per tonne for the year 2007 = $$\frac{330}{150\times100000}=\frac{2.2}{100000}$$ crore/tonne

Value per tonne for the year 2009 = $$\frac{500}{200\times100000}=\frac{2.5}{100000}$$ crore/tonne

Hence, the correct answer is Option C