The bar chart below shows the revenues received, in million US Dollars (USD), from subscribers to a particular Internet service. The data covers the period 2003 to 2008 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.
Y axis- Subscription revenue in million US dollars
Consider the annual percent 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?