Quarter	Millions of US Dollars
1972-04-01	20
1972-07-01	20
1972-10-01	20
1973-01-01	22
1973-04-01	24
1973-07-01	50
1973-10-01	46
1974-01-01	47
1974-04-01	47
1974-07-01	48
1974-10-01	54
1975-01-01	80
1975-04-01	93
1975-07-01	87
1975-10-01	108
1976-01-01	109
1976-04-01	134
1976-07-01	135
1976-10-01	213
1977-01-01	211
1977-04-01	258
1977-07-01	311
1977-10-01	323
1978-01-01	329
1978-04-01	329
1978-07-01	290
1978-10-01	290
1979-01-01	285
1979-04-01	284
1979-07-01	290
1979-10-01	290
1980-01-01	279
1980-04-01	289
1980-07-01	286
1980-10-01	279
1981-01-01	347
1981-04-01	336
1981-07-01	331
1981-10-01	368
1982-01-01	362
1982-04-01	396
1982-07-01	396
1982-10-01	376
1983-01-01	373
1983-04-01	343
1983-07-01	335
1983-10-01	326
1984-01-01	326
1984-04-01	325
1984-07-01	296
1984-10-01	370
1985-01-01	355
1985-04-01	329
1985-07-01	332
1985-10-01	376
1986-01-01	303
1986-04-01	305
1986-07-01	381
1986-10-01	438
1987-01-01	483
1987-04-01	619
1987-07-01	620
1987-10-01	872
1988-01-01	1020
1988-04-01	992
1988-07-01	957
1988-10-01	985
1989-01-01	960
1989-04-01	1097
1989-07-01	1185
1989-10-01	1200
1990-01-01	1382
1990-04-01	1542
1990-07-01	1697
1990-10-01	1849
1991-01-01	1720
1991-04-01	1882
1991-07-01	2020
1991-10-01	2000
1992-01-01	1864
1992-04-01	1864
1992-07-01	1998
1992-10-01	1902
1993-01-01	2120
1993-04-01	2149
1993-07-01	2812
1993-10-01	3587
1994-01-01	4415
1994-04-01	4992
1994-07-01	5515
1994-10-01	5795
1995-01-01	5748
1995-04-01	5452
1995-07-01	5408
1995-10-01	5373
1996-01-01	5520
1996-04-01	6251
1996-07-01	6115
1996-10-01	6320
1997-01-01	6685
1997-04-01	6871
1997-07-01	8253
1997-10-01	8012
1998-01-01	7876
1998-04-01	8533
1998-07-01	8794
1998-10-01	9072
1999-01-01	9907
1999-04-01	10169
1999-07-01	11040
1999-10-01	12504
2000-01-01	13033
2000-04-01	14920
2000-07-01	15331
2000-10-01	15968
2001-01-01	15151
2001-04-01	17097
2001-07-01	17357
2001-10-01	21829
2002-01-01	23868
2002-04-01	25785
2002-07-01	24707
2002-10-01	24753
2003-01-01	24507
2003-04-01	24722
2003-07-01	25919
2003-10-01	29633
2004-01-01	30054
2004-04-01	30648
2004-07-01	30111
2004-10-01	30679
2005-01-01	33040
2005-04-01	33182
2005-07-01	33378
2005-10-01	33054
2006-01-01	33485
2006-04-01	34974
2006-07-01	37875
2006-10-01	39296
2007-01-01	41061
2007-04-01	42545
2007-07-01	43109
2007-10-01	45004
2008-01-01	46078
2008-04-01	51153
2008-07-01	52907
2008-10-01	53245
2009-01-01	52709
2009-04-01	56955
2009-07-01	58361
2009-10-01	59532
2010-01-01	59892
2010-04-01	61105
2010-07-01	63180
2010-10-01	64222
2011-01-01	63896
2011-04-01	70094
2011-07-01	70058
2011-10-01	68446
2012-01-01	67562
2012-04-01	68123
2012-07-01	71564
2012-10-01	75643
2013-01-01	78951
2013-04-01	83162
2013-07-01	84333
2013-10-01	86123
2014-01-01	88264
2014-04-01	91808
2014-07-01	95389
2014-10-01	96443
2015-01-01	96808
2015-04-01	101606
2015-07-01	102340
2015-10-01	101787
2016-01-01	103357
2016-04-01	102589
2016-07-01	104082
2016-10-01	104957
2017-01-01	104708
2017-04-01	107503
2017-07-01	113673
2017-10-01	117108
2018-01-01	117316
2018-04-01	126829