We can use the exponential growth to find the demand in 2002, the formula is
[tex]D=A\left(1+r\right)^t[/tex]Where
A = initial value, here, we will consider it as 2.1 tonnes
r = rate in years, here it's 6%, in decimal 0.06
t = time after 1996, in years.
Therefore
[tex]\begin{gathered} D=2.1\left(1+0.06\right)^6 \\ \\ D=2.1\left(1.06\right)^6 \\ \\ D=2.1\cdot1.41852 \\ \\ D=2.98\text{ tonnes} \end{gathered}[/tex]Hence, in 2002 will be demanded 2.98 tonnes.