Time Series Analysis of Transportation Energy Use Per Dollar of Gross Domestic Product: Transportation Trends in Focus

摘要

Transportation energy use relative to gross domestic product (GDP) has been declining within the past decade. However, the total transportation energy consumed shows only a more recent decline. To see clearly the long-term decline, the seasonal component fi rst must be separated from the underlying trendline to observe the long-term trend of that energy consumption. Then the ratio of the deseaonalized data and GDP can be taken.