Answer
\begin{array}{|c|c|c|c|c|}
\hline & x & y & xy & xx \\
\hline & 2 & 0 & 0 & 4 \\
& 6 & 70 & 420 & 36 \\
& 10 & 900 & 9000 & 100 \\\hline
\Sigma & {\bf 18} & {\bf 970} & {\bf 9420} & {\bf 140} \\\hline
\end{array}
$y=112.5x-351.7$
$998.3$ million in 2012
Work Step by Step
Regression line: $y=mx+b,$
$m=\displaystyle \frac{n(\sum xy)-(\sum x)(\sum y)}{n(\sum x^{2})-(\sum x)^{2}}\qquad b=\frac{\sum y-m(\sum x)}{n}$
$n=$ number of data points.
-----
\begin{array}{|c|c|c|c|c|}
\hline & x & y & xy & xx \\
\hline & 2 & 0 & 0 & 4 \\
& 6 & 70 & 420 & 36 \\
& 10 & 900 & 9000 & 100 \\\hline
Sigma & {\bf 18} & {\bf 970} & {\bf 9420} & {\bf 140} \\\hline
\end{array}
$m=\displaystyle \frac{3(9420)-(10)(970)}{n(140)-(18)^{2}}=112.5$
$b=\displaystyle \frac{970-112.5(18)}{3}=-351.7$
$y=112.5x-351.7$
In 2012, x=12 and
$y=112.5(12)-351.7=998.3$
