Quarter	Millions of US Dollars
2000-01-01	4557
2000-04-01	4698
2000-07-01	4959
2000-10-01	5112
2001-01-01	5426
2001-04-01	5493
2001-07-01	5879
2001-10-01	5993
2002-01-01	5897
2002-04-01	7062
2002-07-01	6941
2002-10-01	7503
2003-01-01	8266
2003-04-01	8998
2003-07-01	9134
2003-10-01	9687
2004-01-01	9165
2004-04-01	10158
2004-07-01	10214
2004-10-01	11348
2005-01-01	11175
2005-04-01	10590
2005-07-01	10743
2005-10-01	10817
2006-01-01	10581
2006-04-01	11163
2006-07-01	11150
2006-10-01	13520
2007-01-01	13965
2007-04-01	14478
2007-07-01	14714
2007-10-01	15608
2008-01-01	16667
2008-04-01	16229
2008-07-01	14669
2008-10-01	14965
2009-01-01	13458
2009-04-01	15475
2009-07-01	16644
2009-10-01	18240
2010-01-01	17305
2010-04-01	16101
2010-07-01	19793
2010-10-01	19728
2011-01-01	21167
2011-04-01	20965
2011-07-01	21050
2011-10-01	20718
2012-01-01	22284
2012-04-01	22220
2012-07-01	22853
2012-10-01	23254
2013-01-01	23234
2013-04-01	25358
2013-07-01	26227
2013-10-01	28801
2014-01-01	29573
2014-04-01	30609
2014-07-01	28554
2014-10-01	28674
2015-01-01	27324
2015-04-01	28227
2015-07-01	28147
2015-10-01	27681
2016-01-01	29392
2016-04-01	28584
2016-07-01	29155
2016-10-01	28175
2017-01-01	30306
2017-04-01	30198
2017-07-01	31279
2017-10-01	33660
2018-01-01	34348