Quarter	Gigawatt Hours
1997-01-01	2636
1997-04-01	2707
1997-07-01	2761
1997-10-01	2746
1998-01-01	2792
1998-04-01	2889
1998-07-01	2958
1998-10-01	2989
1999-01-01	3113
1999-04-01	3103
1999-07-01	3192
1999-10-01	3265
2000-01-01	3266
2000-04-01	3322
2000-07-01	3312
2000-10-01	3295
2001-01-01	3434
2001-04-01	3430
2001-07-01	3422
2001-10-01	3476
2002-01-01	3477
2002-04-01	3514
2002-07-01	3528
2002-10-01	3599
2003-01-01	3726
2003-04-01	3757
2003-07-01	3765
2003-10-01	3831
2004-01-01	3980
2004-04-01	4059
2004-07-01	4108
2004-10-01	4143
2005-01-01	4209
2005-04-01	4247
2005-07-01	4336
2005-10-01	4400
2006-01-01	4444
2006-04-01	4543
2006-07-01	4525
2006-10-01	4620
2007-01-01	4753
2007-04-01	4800
2007-07-01	4842
2007-10-01	4840
2008-01-01	4929
2008-04-01	4790
2008-07-01	4927
2008-10-01	4924
2009-01-01	4875
2009-04-01	4731
2009-07-01	4931
2009-10-01	4927
2010-01-01	4724
2010-04-01	4899
2010-07-01	5267
2010-10-01	5163
2011-01-01	5107
2011-04-01	5261
2011-07-01	5403
2011-10-01	5469