Quarter	Millions of US Dollars
1975-10-01	18
1976-01-01	18
1976-04-01	18
1976-07-01	18
1976-10-01	18
1977-01-01	18
1977-04-01	18
1977-07-01	18
1977-10-01	18
1978-01-01	18
1978-04-01	18
1978-07-01	122
1978-10-01	124
1979-01-01	156
1979-04-01	155
1979-07-01	184
1979-10-01	182
1980-01-01	170
1980-04-01	185
1980-07-01	230
1980-10-01	221
1981-01-01	210
1981-04-01	238
1981-07-01	238
1981-10-01	275
1982-01-01	256
1982-04-01	449
1982-07-01	480
1982-10-01	578
1983-01-01	608
1983-04-01	603
1983-07-01	894
1983-10-01	892
1984-01-01	903
1984-04-01	884
1984-07-01	835
1984-10-01	828
1985-01-01	829
1985-04-01	831
1985-07-01	834
1985-10-01	809
1986-01-01	1136
1986-04-01	1161
1986-07-01	1181
1986-10-01	1151
1987-01-01	1280
1987-04-01	1277
1987-07-01	1228
1987-10-01	1229
1988-01-01	1218
1988-04-01	1187
1988-07-01	1108
1988-10-01	1299
1989-01-01	1234
1989-04-01	1225
1989-07-01	1124
1989-10-01	1153
1990-01-01	1162
1990-04-01	1113
1990-07-01	1430
1990-10-01	1670
1991-01-01	1635
1991-04-01	1924
1991-07-01	1926
1991-10-01	1961
1992-01-01	2014
1992-04-01	1869
1992-07-01	2123
1992-10-01	2252
1993-01-01	2217
1993-04-01	2206
1993-07-01	2222
1993-10-01	2233
1994-01-01	2324
1994-04-01	3411
1994-07-01	3741
1994-10-01	3814
1995-01-01	3303
1995-04-01	3302
1995-07-01	3427
1995-10-01	3760
1996-01-01	3909
1996-04-01	4113
1996-07-01	4762
1996-10-01	5724
1997-01-01	6630
1997-04-01	6963
1997-07-01	6629
1997-10-01	6455
1998-01-01	5579
1998-04-01	5945
1998-07-01	5870
1998-10-01	5584
1999-01-01	5501
1999-04-01	5516
1999-07-01	3797
1999-10-01	3398
2000-01-01	4124
2000-04-01	3334
2000-07-01	3303
2000-10-01	2763
2001-01-01	2398
2001-04-01	2023
2001-07-01	1858
2001-10-01	1857
2002-01-01	1780
2002-04-01	1915
2002-07-01	1745
2002-10-01	1895
2003-01-01	1900
2003-04-01	2287
2003-07-01	2631
2003-10-01	2629
2004-01-01	3936
2004-04-01	3962
2004-07-01	3962
2004-10-01	4010
2005-01-01	4213
2005-04-01	5192
2005-07-01	5290
2005-10-01	6575
2006-01-01	8580
2006-04-01	8342
2006-07-01	7942
2006-10-01	8011
2007-01-01	9360
2007-04-01	10237
2007-07-01	10237
2007-10-01	10214
2008-01-01	12211
2008-04-01	13809
2008-07-01	13761
2008-10-01	13460
2009-01-01	18160
2009-04-01	18710
2009-07-01	19676
2009-10-01	20954
2010-01-01	23810
2010-04-01	24080
2010-07-01	23889
2010-10-01	24437
2011-01-01	23981
2011-04-01	28130
2011-07-01	28184
2011-10-01	31015
2012-01-01	35052
2012-04-01	40463
2012-07-01	40409
2012-10-01	42650
2013-01-01	43717
2013-04-01	48772
2013-07-01	51343
2013-10-01	51382
2014-01-01	54136
2014-04-01	54964
2014-07-01	58529
2014-10-01	58305
2015-01-01	64339
2015-04-01	71306
2015-07-01	74819
2015-10-01	78357
2016-01-01	80310
2016-04-01	89424
2016-07-01	88190
2016-10-01	90405
2017-01-01	92735
2017-04-01	98368
2017-07-01	106042
2017-10-01	109909
2018-01-01	112103
2018-04-01	117600