Quarter	US dollars
1986-09-30	3060
1986-12-31	3010
1987-03-31	2740
1987-06-30	3497
1987-09-30	3971
1987-12-31	4134
1988-03-31	4193
1988-06-30	4253
1988-09-30	4385
1988-12-31	4341
1989-03-31	4569
1989-06-30	4288
1989-09-30	4029
1989-12-31	3748
1990-03-31	3946
1990-06-30	4143
1990-09-30	4451
1990-12-31	4032
1991-03-31	3848
1991-06-30	3672
1991-09-30	3847
1991-12-31	4338
1992-03-31	4069
1992-06-30	4307
1992-09-30	3660
1992-12-31	3353
1993-03-31	3411
1993-06-30	3510
1993-09-30	2947
1993-12-31	2444
1994-03-31	2168
1994-06-30	2951
1994-09-30	2930
1994-12-31	2063
1995-03-31	1995
1995-06-30	1945
1995-09-30	2456
1995-12-31	1797
1996-03-31	2667
1996-06-30	2576
1996-09-30	2832
1996-12-31	2503
1997-03-31	3086
1997-06-30	2850
1997-09-30	2385
1997-12-31	2722
1998-03-31	3298
1998-06-30	2970
1998-09-30	2844
1998-12-31	3250
1999-03-31	4606
1999-06-30	3984
1999-09-30	3963
1999-12-31	6544
2000-03-31	4101
2000-06-30	5758
2000-09-30	8354
2000-12-31	9055
2001-03-31	8944
2001-06-30	7350
2001-09-30	8622
2001-12-31	6723
2002-03-31	5738
2002-06-30	6212
2002-09-30	8797
2002-12-31	10521
2003-03-31	15585
2003-06-30	17931
2003-09-30	19861
2003-12-31	20821
2004-03-31	19540
2004-06-30	24950
2004-09-30	21794
2004-12-31	22218
2005-03-31	30053
2005-06-30	24543
2005-09-30	36923
2005-12-31	45867
2006-03-31	39329
2006-06-30	55213
2006-09-30	47867
2006-12-31	56719
2007-03-31	62917
2007-06-30	67027
2007-09-30	67007
2007-12-31	65471
2008-03-31	59922
2008-06-30	54580
2008-09-30	44824
2008-12-31	36820
2009-03-31	33837
2009-06-30	19394
2009-09-30	23311
2009-12-31	23876
2010-03-31	26480
2010-06-30	24231
2010-09-30	25237
2010-12-31	25615
2011-03-31	32880
2011-06-30	27490
2011-09-30	27831
2011-12-31	20246
2012-03-31	24926
2012-06-30	23769
2012-09-30	19282
2012-12-31	19658
2013-03-31	23848
2013-06-30	19967
2013-09-30	23220
2013-12-31	21125
2014-03-31	19344
2014-06-30	20458
2014-09-30	16798
2014-12-31	24724
2015-03-31	19234
2015-06-30	28348
2015-09-30	27212
2015-12-31	25033
2016-03-31	25481
2016-06-30	26002
2016-09-30	27683
2016-12-31	26667
2017-03-31	32913
2017-06-30	30771
2017-09-30	33347
2017-12-31	39192
2018-03-31	36714
2018-06-30	30403
2018-09-30	29959
2018-12-31	33100
2019-03-31	30168
2019-06-30	31218
2019-09-30	28394
2019-12-31	30343
2020-03-31	33392
2020-06-30	33414
2020-09-30	28989
2020-12-31	28981
2021-03-31	29429
2021-06-30	28237
2021-09-30	28098
2021-12-31	31777
2022-03-31	30110
2022-06-30	27921
2022-09-30	35670
2022-12-31	36564
2023-03-31	35058
2023-06-30	33901
2023-09-30	36878