<image>A company has 2 shareholders and 20 workers. From 2003 to 2005, the total annual profit of the shareholders and the total annual wages of the workers are shown in figure ①. 
(1) Based on figure ①, fill in the blanks in figure ②; 
(2) In 2003, how many times was the average profit of the shareholders compared to the average wage of the workers?
(3) Assuming that in the coming years, the wages of the workers and the profits of the shareholders continue to grow at the rate shown in figure ①, in which year will the average profit of the shareholders be 8 times the average wage of the workers? 
\frac{    }