Quarter	Millions of US Dollars
1974-10-01	10
1975-01-01	10
1975-04-01	10
1975-07-01	9
1975-10-01	29
1976-01-01	30
1976-04-01	30
1976-07-01	31
1976-10-01	31
1977-01-01	30
1977-04-01	30
1977-07-01	32
1977-10-01	37
1978-01-01	40
1978-04-01	54
1978-07-01	65
1978-10-01	62
1979-01-01	59
1979-04-01	60
1979-07-01	64
1979-10-01	85
1980-01-01	73
1980-04-01	83
1980-07-01	82
1980-10-01	76
1981-01-01	86
1981-04-01	81
1981-07-01	83
1981-10-01	92
1982-01-01	85
1982-04-01	95
1982-07-01	92
1982-10-01	100
1983-01-01	130
1983-04-01	128
1983-07-01	127
1983-10-01	124
1984-01-01	125
1984-04-01	146
1984-07-01	136
1984-10-01	131
1985-01-01	130
1985-04-01	133
1985-07-01	155
1985-10-01	164
1986-01-01	160
1986-04-01	173
1986-07-01	188
1986-10-01	191
1987-01-01	206
1987-04-01	181
1987-07-01	180
1987-10-01	215
1988-01-01	201
1988-04-01	246
1988-07-01	262
1988-10-01	307
1989-01-01	236
1989-04-01	192
1989-07-01	199
1989-10-01	192
1990-01-01	198
1990-04-01	205
1990-07-01	223
1990-10-01	188
1991-01-01	164
1991-04-01	153
1991-07-01	164
1991-10-01	150
1992-01-01	136
1992-04-01	146
1992-07-01	164
1992-10-01	138
1993-01-01	135
1993-04-01	127
1993-07-01	204
1993-10-01	196
1994-01-01	206
1994-04-01	216
1994-07-01	226
1994-10-01	221
1995-01-01	254
1995-04-01	252
1995-07-01	253
1995-10-01	213
1996-01-01	206
1996-04-01	196
1996-07-01	80
1996-10-01	74
1997-01-01	69
1997-04-01	69
1997-07-01	69
2008-04-01	295
2008-07-01	272
2008-10-01	281
2009-01-01	263
2009-04-01	556
2009-07-01	583
2009-10-01	583
2010-01-01	567
2010-04-01	554
2010-07-01	616
2010-10-01	641
2011-01-01	655
2011-04-01	718
2011-07-01	666
2011-10-01	639
2012-01-01	665
2012-04-01	314
2012-07-01	321
2012-10-01	328
2013-01-01	315
2013-04-01	318
2013-07-01	331
2013-10-01	562
2014-01-01	565
2014-04-01	225
2014-07-01	209
2014-10-01	202
2015-01-01	206
2015-04-01	215
2015-07-01	205
2015-10-01	201
2016-01-01	208
2016-04-01	204
2016-07-01	205
2016-10-01	196
2017-01-01	200
2017-04-01	209
2017-07-01	206
2017-10-01	410
2018-01-01	418
2018-04-01	403