<image>Below is a statistical chart of the per capita availability of sugar and fruit in China from 1987 to 2007.
1. Which type of food has a higher per capita availability according to the chart? From which year did the per capita availability of both types of food undergo significant changes?
2. From which year did the per capita availability of sugar start decreasing, and what does this indicate?
3. What else did you observe from the chart? What issues do these observations illustrate?