Quarter	Millions of US Dollars
1994-07-01	16
1994-10-01	5
1995-01-01	5
1995-04-01	5
1995-07-01	311
1995-10-01	319
1996-01-01	369
1996-04-01	475
1996-07-01	602
1996-10-01	871
1997-01-01	944
1997-04-01	1420
1997-07-01	1508
1997-10-01	2306
1998-01-01	2303
1998-04-01	3286
1998-07-01	3798
1998-10-01	3986
1999-01-01	4533
1999-04-01	4576
1999-07-01	4616
1999-10-01	5162
2000-01-01	5109
2000-04-01	5703
2000-07-01	5899
2000-10-01	6949
2001-01-01	6885
2001-04-01	7841
2001-07-01	9102
2001-10-01	8956
2002-01-01	9899
2002-04-01	10397
2002-07-01	11233
2002-10-01	14559
2003-01-01	15294
2003-04-01	15615
2003-07-01	15197
2003-10-01	15322
2004-01-01	14358
2004-04-01	15567
2004-07-01	16901
2004-10-01	19139
2005-01-01	17924
2005-04-01	20047
2005-07-01	19862
2005-10-01	20845
2006-01-01	21751
2006-04-01	24660
2006-07-01	24455
2006-10-01	24152
2007-01-01	23913
2007-04-01	23930
2007-07-01	24167
2007-10-01	23977
2008-01-01	24062
2008-04-01	24440
2008-07-01	24024
2008-10-01	23996
2009-01-01	26052
2009-04-01	25794
2009-07-01	25468
2009-10-01	23455
2010-01-01	23746
2010-04-01	23586
2010-07-01	23485
2010-10-01	24490
2011-01-01	25063
2011-04-01	25375
2011-07-01	26477
2011-10-01	29051
2012-01-01	28307
2012-04-01	31440
2012-07-01	30671
2012-10-01	34759
2013-01-01	33849
2013-04-01	36374
2013-07-01	36586
2013-10-01	36612
2014-01-01	36612
2014-04-01	37098
2014-07-01	37003
2014-10-01	36963
2015-01-01	38790
2015-04-01	36329
2015-07-01	35830
2015-10-01	37402
2016-01-01	37128
2016-04-01	39103
2016-07-01	39108
2016-10-01	39183
2017-01-01	40777
2017-04-01	40863
2017-07-01	40815
2017-10-01	36692
2018-01-01	36030
2018-04-01	40872