Year	Gigawatt Hours
1997-01-01	2712
1998-01-01	2907
1999-01-01	3168
2000-01-01	3299
2001-01-01	3441
2002-01-01	3529
2003-01-01	3770
2004-01-01	4073
2005-01-01	4298
2006-01-01	4533
2007-01-01	4809
2008-01-01	4892
2009-01-01	4866
2010-01-01	5013
2011-01-01	5310