The bar chart shows the revenue received, in million US dollars (USD), from subscribers to a particular Internet service. The data covers the period 2003 to 2007 for the United States (US) and Europe. The bar chart also shows the estimated revenues from subscription to this service for the period 2008 to 2010.
Consider the annual percentage change in the gap between subscription revenues in the US and Europe. What is the
year in which the absolute value of this change is the highest?