Quarter	Millions of US Dollars
1989-10-01	12416
1990-01-01	12854
1990-04-01	13367
1990-07-01	14122
1990-10-01	14682
1991-01-01	13075
1991-04-01	12567
1991-07-01	13537
1991-10-01	14746
1992-01-01	14270
1992-04-01	16041
1992-07-01	17656
1992-10-01	15837
1993-01-01	16020
1993-04-01	15580
1993-07-01	15239
1993-10-01	14711
1994-01-01	15567
1994-04-01	16626
1994-07-01	17210
1994-10-01	15560
1995-01-01	17150
1995-04-01	17055
1995-07-01	16525
1995-10-01	16427
1996-01-01	16343
1996-04-01	16073
1996-07-01	16580
1996-10-01	15949
1997-01-01	15156
1997-04-01	15874
1997-07-01	15191
1997-10-01	14340
1998-01-01	14264
1998-04-01	15415
1998-07-01	16963
1998-10-01	12169
1999-01-01	11455
1999-04-01	10996
1999-07-01	11470
1999-10-01	10760
2000-01-01	9868
2000-04-01	10024
2000-07-01	10097
2000-10-01	12975
2001-01-01	11940
2001-04-01	12274
2001-07-01	13379
2001-10-01	13669
2002-01-01	12861
2002-04-01	14409
2002-07-01	14351
2002-10-01	16300
2003-01-01	17475
2003-04-01	19639
2003-07-01	19978
2003-10-01	25821
2004-01-01	24419
2004-04-01	25302
2004-07-01	24400
2004-10-01	27639
2005-01-01	21737
2005-04-01	19834
2005-07-01	19479
2005-10-01	18321
2006-01-01	18180
2006-04-01	19161
2006-07-01	18005
2006-10-01	21000
2007-01-01	26202
2007-04-01	33066
2007-07-01	30946
2007-10-01	29227
2008-01-01	29446
2008-04-01	33211
2008-07-01	31416
2008-10-01	27373
2009-01-01	30704
2009-04-01	32300
2009-07-01	34129
2009-10-01	39285
2010-01-01	38674
2010-04-01	36192
2010-07-01	37175
2010-10-01	37513
2011-01-01	38828
2011-04-01	45410
2011-07-01	43956
2011-10-01	41997
2012-01-01	44222
2012-04-01	42904
2012-07-01	46917
2012-10-01	41233
2013-01-01	40148
2013-04-01	41668
2013-07-01	44987
2013-10-01	48266
2014-01-01	50976
2014-04-01	51730
2014-07-01	48724
2014-10-01	48227
2015-01-01	43488
2015-04-01	48203
2015-07-01	48708
2015-10-01	49954
2016-01-01	66119
2016-04-01	63243
2016-07-01	63384
2016-10-01	59172
2017-01-01	60020
2017-04-01	67145
2017-07-01	68896
2017-10-01	69371
2018-01-01	74615