Quarter	Millions of US Dollars
1989-10-01	19974
1990-01-01	21407
1990-04-01	22268
1990-07-01	24590
1990-10-01	28602
1991-01-01	25869
1991-04-01	24455
1991-07-01	27462
1991-10-01	30959
1992-01-01	29980
1992-04-01	33502
1992-07-01	37842
1992-10-01	32981
1993-01-01	34697
1993-04-01	32285
1993-07-01	34676
1993-10-01	34455
1994-01-01	37780
1994-04-01	39841
1994-07-01	40994
1994-10-01	41506
1995-01-01	47505
1995-04-01	47535
1995-07-01	48720
1995-10-01	48013
1996-01-01	48286
1996-04-01	48986
1996-07-01	49273
1996-10-01	50802
1997-01-01	49529
1997-04-01	49008
1997-07-01	50335
1997-10-01	48349
1998-01-01	51515
1998-04-01	48114
1998-07-01	50074
1998-10-01	54499
1999-01-01	51051
1999-04-01	51331
1999-07-01	55063
1999-10-01	56593
2000-01-01	51528
2000-04-01	53476
2000-07-01	56304
2000-10-01	62578
2001-01-01	64766
2001-04-01	65485
2001-07-01	70150
2001-10-01	70946
2002-01-01	72737
2002-04-01	80944
2002-07-01	75936
2002-10-01	83304
2003-01-01	84887
2003-04-01	83516
2003-07-01	85600
2003-10-01	94457
2004-01-01	86392
2004-04-01	87965
2004-07-01	90625
2004-10-01	105305
2005-01-01	107139
2005-04-01	103301
2005-07-01	104404
2005-10-01	105915
2006-01-01	104445
2006-04-01	109481
2006-07-01	111750
2006-10-01	118711
2007-01-01	120451
2007-04-01	123252
2007-07-01	130650
2007-10-01	137751
2008-01-01	129427
2008-04-01	134215
2008-07-01	129658
2008-10-01	417861
2009-01-01	413541
2009-04-01	457416
2009-07-01	494848
2009-10-01	504940
2010-01-01	488115
2010-04-01	459181
2010-07-01	486996
2010-10-01	465400
2011-01-01	482212
2011-04-01	526072
2011-07-01	471689
2011-10-01	463330
2012-01-01	564401
2012-04-01	606195
2012-07-01	645981
2012-10-01	795763
2013-01-01	788121
2013-04-01	813193
2013-07-01	866915
2013-10-01	888272
2014-01-01	914876
2014-04-01	934196
2014-07-01	873280
2014-10-01	854389
2015-01-01	862721
2015-04-01	879756
2015-07-01	877934
2015-10-01	948274
2016-01-01	897208
2016-04-01	831189
2016-07-01	859732
2016-10-01	843025
2017-01-01	874825
2017-04-01	947572
2017-07-01	984494
2017-10-01	987336
2018-01-01	1031499