Year: 2005
Gallons (Trillions): 4.09
Year: 2006
Gallons (Trillions): 3.86
Year: 2007
Gallons (Trillions): 4.27
Year: 2008
Gallons (Trillions): 3.79
Year: 2009
Gallons (Trillions): 3.60
Year: 2010
Gallons (Trillions): 3.82
Year: 2011
Gallons (Trillions): 3.80
Year: 2012
Gallons (Trillions): 3.96
Year: 2013
Gallons (Trillions): 3.76
Year: 2014
Gallons (Trillions): 3.66