Quarter	Millions of US Dollars
1997-10-01	1200959
1998-01-01	1194855
1998-04-01	1104323
1998-07-01	1169868
1998-10-01	1335015
1999-01-01	1331350
1999-04-01	1288659
1999-07-01	1491571
1999-10-01	1556052
2000-01-01	1516100
2000-04-01	1423345
2000-07-01	1375358
2000-10-01	1305095
2001-01-01	1221978
2001-04-01	1312134
2001-07-01	1459212
2001-10-01	1387249
2002-01-01	1435652
2002-04-01	1642518
2002-07-01	1658219
2002-10-01	1777396
2003-01-01	1883211
2003-04-01	1886285
2003-07-01	2054490
2003-10-01	2150704
2004-01-01	2286155
2004-04-01	2183547
2004-07-01	2240911
2004-10-01	2507035
2005-01-01	2531604
2005-04-01	2468715
2005-07-01	2434653
2005-10-01	2611501
2006-01-01	2641809
2006-04-01	2648104
2006-07-01	2598801
2006-10-01	2559743
2007-01-01	2591557
2007-04-01	2471486
2007-07-01	2631063
2007-10-01	2714485
2008-01-01	3049915
2008-04-01	2794240
2008-07-01	2782185
2008-10-01	3217300
2009-01-01	2891449
2009-04-01	2903453
2009-07-01	3129026
2009-10-01	3007488
2010-01-01	2951020
2010-04-01	3148419
2010-07-01	3352451
2010-10-01	3378119
2011-01-01	3225709
2011-04-01	3295937
2011-07-01	3408885
2011-10-01	3385481
2012-01-01	3181166
2012-04-01	3281235
2012-07-01	3324945
2012-10-01	3071954
2013-01-01	2770944
2013-04-01	2588756
2013-07-01	2600174
2013-10-01	2409467
2014-01-01	2445004
2014-04-01	2459272
2014-07-01	2261369
2014-10-01	2089448
2015-01-01	2087732
2015-04-01	2013292
2015-07-01	2052608
2015-10-01	2064706
2016-01-01	2383594
2016-04-01	2510233
2016-07-01	2500833
2016-10-01	2163503
2017-01-01	2294041
2017-04-01	2264676
2017-07-01	2238546
2017-10-01	2260383
2018-01-01	2426315