Quarter	US dollars
1986-09-30	1440
1986-12-31	1291
1987-03-31	1167
1987-06-30	1172
1987-09-30	1269
1987-12-31	1294
1988-03-31	1288
1988-06-30	1373
1988-09-30	1344
1988-12-31	1411
1989-03-31	1314
1989-06-30	1302
1989-09-30	1591
1989-12-31	1616
1990-03-31	1577
1990-06-30	1663
1990-09-30	1937
1990-12-31	1392
1991-03-31	1398
1991-06-30	1591
1991-09-30	2114
1991-12-31	2293
1992-03-31	2414
1992-06-30	2295
1992-09-30	2209
1992-12-31	2249
1993-03-31	2231
1993-06-30	2119
1993-09-30	2142
1993-12-31	2098
1994-03-31	2047
1994-06-30	2002
1994-09-30	2041
1994-12-31	2069
1995-03-31	2013
1995-06-30	2123
1995-09-30	2025
1995-12-31	2090
1996-03-31	1911
1996-06-30	1941
1996-09-30	1987
1996-12-31	2260
1997-03-31	1908
1997-06-30	2102
1997-09-30	2237
1997-12-31	2274
1998-03-31	2218
1998-06-30	2012
1998-09-30	2035
1998-12-31	1837
1999-03-31	1845
1999-06-30	2144
1999-09-30	2505
1999-12-31	2196
2000-03-31	2301
2000-06-30	2290
2000-09-30	2397
2000-12-31	2346
2001-03-31	2323
2001-06-30	2295
2001-09-30	2502
2001-12-31	2156
2002-03-31	2170
2002-06-30	2684
2002-09-30	2279
2002-12-31	2370
2003-03-31	2312
2003-06-30	2645
2003-09-30	2646
2003-12-31	2652
2004-03-31	2783
2004-06-30	2589
2004-09-30	2780
2004-12-31	3059
2005-03-31	2632
2005-06-30	2691
2005-09-30	2602
2005-12-31	2847
2006-03-31	3073
2006-06-30	3635
2006-09-30	3474
2006-12-31	3611
2007-03-31	3495
2007-06-30	3349
2007-09-30	4027
2007-12-31	4101
2008-03-31	2416
2008-06-30	3045
2008-09-30	3101
2008-12-31	2352
2009-03-31	2009
2009-06-30	1570
2009-09-30	1626
2009-12-31	1799
2010-03-31	2347
2010-06-30	2583
2010-09-30	2384
2010-12-31	2559
2011-03-31	2599
2011-06-30	2760
2011-09-30	2821
2011-12-31	2983
2012-03-31	2629
2012-06-30	2613
2012-09-30	2312
2012-12-31	2254
2013-03-31	2748
2013-06-30	2726
2013-09-30	2626
2013-12-31	2939
2014-03-31	2863
2014-06-30	3915
2014-09-30	3998
2014-12-31	3811
2015-03-31	3178
2015-06-30	3153
2015-09-30	3227
2015-12-31	2907
2016-03-31	2727
2016-06-30	2762
2016-09-30	2715
2016-12-31	2997
2017-03-31	2992
2017-06-30	2552
2017-09-30	2953
2017-12-31	3164
2018-03-31	3078
2018-06-30	2378
2018-09-30	2479
2018-12-31	2190
2019-03-31	3097
2019-06-30	3305
2019-09-30	3219
2019-12-31	2820
2020-03-31	3192
2020-06-30	3122
2020-09-30	3234
2020-12-31	2979
2021-03-31	2524
2021-06-30	2752
2021-09-30	3275
2021-12-31	4196
2022-03-31	3556
2022-06-30	3168
2022-09-30	3528
2022-12-31	3159
2023-03-31	3411
2023-06-30	3430
2023-09-30	3588