Quarter	US dollars
1986-09-30	1598
1986-12-31	1592
1987-03-31	1709
1987-06-30	1737
1987-09-30	1668
1987-12-31	1623
1988-03-31	1685
1988-06-30	1630
1988-09-30	1702
1988-12-31	1789
1989-03-31	1587
1989-06-30	1492
1989-09-30	1444
1989-12-31	1332
1990-03-31	1308
1990-06-30	1302
1990-09-30	1323
1990-12-31	1351
1991-03-31	1338
1991-06-30	1275
1991-09-30	1292
1991-12-31	1327
1992-03-31	1253
1992-06-30	1260
1992-09-30	1273
1992-12-31	1129
1993-03-31	1203
1993-06-30	1225
1993-09-30	1164
1993-12-31	1319
1994-03-31	1316
1994-06-30	1311
1994-09-30	1418
1994-12-31	1724
1995-03-31	1487
1995-06-30	1596
1995-09-30	1755
1995-12-31	1852
1996-03-31	1908
1996-06-30	2429
1996-09-30	2667
1996-12-31	3150
1997-03-31	3678
1997-06-30	3583
1997-09-30	4061
1997-12-31	3226
1998-03-31	3162
1998-06-30	2654
1998-09-30	2584
1998-12-31	2635
1999-03-31	2483
1999-06-30	2417
1999-09-30	2024
1999-12-31	1711
2000-03-31	1457
2000-06-30	1324
2000-09-30	1344
2000-12-31	1201
2001-03-31	1198
2001-06-30	1222
2001-09-30	1047
2001-12-31	1206
2002-03-31	1289
2002-06-30	1375
2002-09-30	1396
2002-12-31	1303
2003-03-31	1283
2003-06-30	1388
2003-09-30	1186
2003-12-31	1198
2004-03-31	1300
2004-06-30	1293
2004-09-30	1424
2004-12-31	1508
2005-03-31	1677
2005-06-30	1556
2005-09-30	1724
2005-12-31	1809
2006-03-31	2008
2006-06-30	2359
2006-09-30	1930
2006-12-31	2002
2007-03-31	2607
2007-06-30	2516
2007-09-30	2383
2007-12-31	2385
2008-03-31	2000
2008-06-30	2029
2008-09-30	1705
2008-12-31	1444
2009-03-31	1530
2009-06-30	1395
2009-09-30	2026
2009-12-31	2099
2010-03-31	2844
2010-06-30	2500
2010-09-30	3019
2010-12-31	2664
2011-03-31	2800
2011-06-30	2875
2011-09-30	2785
2011-12-31	2103
2012-03-31	1988
2012-06-30	1966
2012-09-30	2225
2012-12-31	2884
2013-03-31	2687
2013-06-30	2942
2013-09-30	3033
2013-12-31	3034
2014-03-31	2945
2014-06-30	3597
2014-09-30	3794
2014-12-31	3576
2015-03-31	3491
2015-06-30	3378
2015-09-30	3700
2015-12-31	3806
2016-03-31	2909
2016-06-30	3027
2016-09-30	3146
2016-12-31	2965
2017-03-31	3161
2017-06-30	3438
2017-09-30	3116
2017-12-31	3051
2018-03-31	2423
2018-06-30	3902
2018-09-30	2848
2018-12-31	2888
2019-03-31	2915
2019-06-30	2844
2019-09-30	2744
2019-12-31	2235
2020-03-31	2558
2020-06-30	2617
2020-09-30	2219
2020-12-31	2358
2021-03-31	2252
2021-06-30	2322
2021-09-30	2227
2021-12-31	2086
2022-03-31	2835
2022-06-30	2440
2022-09-30	1997
2022-12-31	1720
2023-03-31	1506
2023-06-30	2268
2023-09-30	1976