Using the table below, determine the growth in real GDP from 1975 to 2005. Round your answer to the nearest whole percent.
Year: 1960, 1975, 1990, 2005
Nominal GDP (billions of dollars): 543.3, 1688.9, 5979.6, 13095.4
Real GDP (billions of 2005 dollars): 2859.5, 4952.8, 8225, 13095.4