Quarter	Millions of US Dollars
1967-04-01	20
1967-07-01	20
1967-10-01	20
1968-01-01	20
1968-04-01	20
1968-07-01	20
1968-10-01	20
1969-01-01	20
1969-04-01	20
1969-07-01	20
1969-10-01	20
1970-01-01	20
1970-04-01	20
1970-07-01	20
1970-10-01	20
1971-01-01	48
1971-04-01	49
1971-07-01	50
1971-10-01	96
1972-01-01	130
1972-04-01	130
1972-07-01	140
1972-10-01	186
1973-01-01	237
1973-04-01	283
1973-07-01	285
1973-10-01	262
1974-01-01	275
1974-04-01	272
1974-07-01	291
1974-10-01	310
1975-01-01	337
1975-04-01	354
1975-07-01	353
1975-10-01	356
1976-01-01	372
1976-04-01	437
1976-07-01	480
1976-10-01	582
1977-01-01	630
1977-04-01	694
1977-07-01	725
1977-10-01	832
1978-01-01	864
1978-04-01	987
1978-07-01	1093
1978-10-01	1109
1979-01-01	1227
1979-04-01	1375
1979-07-01	1501
1979-10-01	1523
1980-01-01	1476
1980-04-01	1759
1980-07-01	1789
1980-10-01	1769
1981-01-01	1660
1981-04-01	1681
1981-07-01	1711
1981-10-01	1913
1982-01-01	1900
1982-04-01	1933
1982-07-01	1887
1982-10-01	2032
1983-01-01	2098
1983-04-01	2185
1983-07-01	2263
1983-10-01	2302
1984-01-01	2400
1984-04-01	2127
1984-07-01	1977
1984-10-01	1981
1985-01-01	1990
1985-04-01	2218
1985-07-01	2505
1985-10-01	2396
1986-01-01	2439
1986-04-01	2537
1986-07-01	3034
1986-10-01	3436
1987-01-01	3571
1987-04-01	3304
1987-07-01	3571
1987-10-01	4017
1988-01-01	4085
1988-04-01	3659
1988-07-01	3662
1988-10-01	4136
1989-01-01	3804
1989-04-01	3707
1989-07-01	3650
1989-10-01	3780
1990-01-01	3631
1990-04-01	3666
1990-07-01	3637
1990-10-01	3584
1991-01-01	3201
1991-04-01	3037
1991-07-01	3204
1991-10-01	3299
1992-01-01	3084
1992-04-01	3249
1992-07-01	3319
1992-10-01	2862
1993-01-01	2723
1993-04-01	2679
1993-07-01	2910
1993-10-01	2494
1994-01-01	2288
1994-04-01	2312
1994-07-01	2331
1994-10-01	2128
1995-01-01	2349
1995-04-01	2251
1995-07-01	2129
1995-10-01	1885
1996-01-01	1608
1996-04-01	1546
1996-07-01	1125
1996-10-01	1113
1997-01-01	1054
1997-04-01	1089
1997-07-01	1059
1997-10-01	989
1998-01-01	967
1998-04-01	949
1998-07-01	989
1998-10-01	690
1999-01-01	650
1999-04-01	1148
1999-07-01	1757
1999-10-01	1680
2000-01-01	1615
2000-04-01	2020
2000-07-01	1439
2000-10-01	1476
2001-01-01	1389
2001-04-01	1349
2001-07-01	1446
2001-10-01	1818
2002-01-01	1801
2002-04-01	2380
2002-07-01	2352
2002-10-01	2496
2003-01-01	2517
2003-04-01	3256
2003-07-01	3332
2003-10-01	3852
2004-01-01	4298
2004-04-01	4267
2004-07-01	4345
2004-10-01	4060
2005-01-01	4578
2005-04-01	3688
2005-07-01	3671
2005-10-01	3534
2006-01-01	3615
2006-04-01	4836
2006-07-01	4817
2006-10-01	5001
2007-01-01	5054
2007-04-01	5392
2007-07-01	5826
2007-10-01	6039
2008-01-01	6468
2008-04-01	6646
2008-07-01	6209
2008-10-01	6048
2009-01-01	5795
2009-04-01	3595
2009-07-01	5403
2009-10-01	7405
2010-01-01	7967
2010-04-01	8365
2010-07-01	9243
2010-10-01	9069
2011-01-01	10198
2011-04-01	10803
2011-07-01	10530
2011-10-01	10343
2012-01-01	11522
2012-04-01	9903
2012-07-01	9176
2012-10-01	9691
2013-01-01	11047
2013-04-01	12164
2013-07-01	12692
2013-10-01	16098
2014-01-01	18522
2014-04-01	19528
2014-07-01	22503
2014-10-01	19964
2015-01-01	22069
2015-04-01	24101
2015-07-01	23487
2015-10-01	23578
2016-01-01	24890
2016-04-01	26199
2016-07-01	28206
2016-10-01	28667
2017-01-01	29027
2017-04-01	35465
2017-07-01	36372
2017-10-01	37564
2018-01-01	40504
2018-04-01	39914