Quarter	US dollars
1986-09-30	2157
1986-12-31	2450
1987-03-31	2395
1987-06-30	2886
1987-09-30	2918
1987-12-31	3247
1988-03-31	3428
1988-06-30	3760
1988-09-30	3828
1988-12-31	3944
1989-03-31	4316
1989-06-30	4263
1989-09-30	4076
1989-12-31	4364
1990-03-31	4628
1990-06-30	4584
1990-09-30	4472
1990-12-31	3752
1991-03-31	3119
1991-06-30	2950
1991-09-30	2994
1991-12-31	3096
1992-03-31	2991
1992-06-30	3223
1992-09-30	3379
1992-12-31	3278
1993-03-31	3320
1993-06-30	3151
1993-09-30	3042
1993-12-31	3142
1994-03-31	3381
1994-06-30	3533
1994-09-30	3556
1994-12-31	3687
1995-03-31	3407
1995-06-30	3381
1995-09-30	2943
1995-12-31	3108
1996-03-31	3238
1996-06-30	3176
1996-09-30	3219
1996-12-31	3354
1997-03-31	3270
1997-06-30	3158
1997-09-30	3274
1997-12-31	3371
1998-03-31	3230
1998-06-30	3265
1998-09-30	3400
1998-12-31	3449
1999-03-31	3570
1999-06-30	3598
1999-09-30	3594
1999-12-31	3621
2000-03-31	2538
2000-06-30	2613
2000-09-30	2317
2000-12-31	2526
2001-03-31	2480
2001-06-30	2661
2001-09-30	2654
2001-12-31	2649
2002-03-31	2610
2002-06-30	2285
2002-09-30	2302
2002-12-31	2298
2003-03-31	2208
2003-06-30	2676
2003-09-30	2696
2003-12-31	2768
2004-03-31	2732
2004-06-30	2862
2004-09-30	3360
2004-12-31	4009
2005-03-31	3861
2005-06-30	4142
2005-09-30	3788
2005-12-31	3936
2006-03-31	4094
2006-06-30	4416
2006-09-30	4192
2006-12-31	4293
2007-03-31	3990
2007-06-30	4384
2007-09-30	4222
2007-12-31	4259
2008-03-31	4638
2008-06-30	4023
2008-09-30	4082
2008-12-31	3549
2009-03-31	3304
2009-06-30	3639
2009-09-30	2982
2009-12-31	2734
2010-03-31	2736
2010-06-30	2534
2010-09-30	3055
2010-12-31	3661
2011-03-31	3237
2011-06-30	2848
2011-09-30	2568
2011-12-31	3309
2012-03-31	2220
2012-06-30	2348
2012-09-30	2142
2012-12-31	2161
2013-03-31	2215
2013-06-30	2116
2013-09-30	2084
2013-12-31	1569
2014-03-31	1933
2014-06-30	1358
2014-09-30	1354
2014-12-31	1150
2015-03-31	744
2015-06-30	1210
2015-09-30	1076
2015-12-31	1115
2016-03-31	958
2016-06-30	1430
2016-09-30	1473
2016-12-31	1561
2017-03-31	1689
2017-06-30	1164
2017-09-30	775
2017-12-31	1729
2018-03-31	705
2018-06-30	582
2018-09-30	1266
2018-12-31	1073
2019-03-31	541
2019-06-30	639
2019-09-30	1110
2019-12-31	471
2020-03-31	3976
2020-06-30	3843
2020-09-30	708
2020-12-31	452
2021-03-31	1549
2021-06-30	2180
2021-09-30	2509
2021-12-31	2312
2022-03-31	1856
2022-06-30	651
2022-09-30	1239
2022-12-31	1333
2023-03-31	1465
2023-06-30	626
2023-09-30	570