The chart below shows the percentage of a drug company's total sales, by region, from 2002 to 2006. Summarize the information by selecting and reporting the main features, and make comparisons where relevant.

The bar chart compares the proportion of drug company’s sales in America, Europe and Asia between 2002 and 2006. Overall, while America and Europe experienced a decrease in drug sales income, there was and opposite tendency in the case of Asia. Furthermore, Asia became the region that highest drug sales income in the year 2006. […]