Quarter	US dollars
1986-09-30	5791
1986-12-31	6831
1987-03-31	8469
1987-06-30	10316
1987-09-30	12527
1987-12-31	16293
1988-03-31	16794
1988-06-30	16057
1988-09-30	16673
1988-12-31	18819
1989-03-31	18554
1989-06-30	16388
1989-09-30	20941
1989-12-31	18253
1990-03-31	16045
1990-06-30	16125
1990-09-30	11480
1990-12-31	10203
1991-03-31	9321
1991-06-30	9789
1991-09-30	9124
1991-12-31	7286
1992-03-31	6630
1992-06-30	8024
1992-09-30	8537
1992-12-31	7570
1993-03-31	9415
1993-06-30	10234
1993-09-30	9362
1993-12-31	9308
1994-03-31	12251
1994-06-30	10625
1994-09-30	13133
1994-12-31	12543
1995-03-31	25561
1995-06-30	25180
1995-09-30	21845
1995-12-31	20900
1996-03-31	18086
1996-06-30	18037
1996-09-30	23506
1996-12-31	26621
1997-03-31	27303
1997-06-30	34788
1997-09-30	27886
1997-12-31	45214
1998-03-31	42048
1998-06-30	48409
1998-09-30	62038
1998-12-31	74727
1999-03-31	57927
1999-06-30	60338
1999-09-30	70298
1999-12-31	69818
2000-03-31	66469
2000-06-30	70585
2000-09-30	72745
2000-12-31	50630
2001-03-31	49787
2001-06-30	58577
2001-09-30	61992
2001-12-31	62909
2002-03-31	62347
2002-06-30	75074
2002-09-30	82600
2002-12-31	72327
2003-03-31	91031
2003-06-30	85469
2003-09-30	106747
2003-12-31	102374
2004-03-31	103546
2004-06-30	106510
2004-09-30	119962
2004-12-31	133595
2005-03-31	119832
2005-06-30	121776
2005-09-30	98545
2005-12-31	96885
2006-03-31	96528
2006-06-30	91433
2006-09-30	84731
2006-12-31	107812
2007-03-31	109783
2007-06-30	103270
2007-09-30	140786
2007-12-31	148407
2008-03-31	229717
2008-06-30	145685
2008-09-30	173763
2008-12-31	113591
2009-03-31	81223
2009-06-30	86875
2009-09-30	82699
2009-12-31	72308
2010-03-31	67037
2010-06-30	63642
2010-09-30	72421
2010-12-31	83264
2011-03-31	77589
2011-06-30	86331
2011-09-30	123484
2011-12-31	150249
2012-03-31	136719
2012-06-30	129029
2012-09-30	122035
2012-12-31	105973
2013-03-31	106635
2013-06-30	118661
2013-09-30	120861
2013-12-31	120684
2014-03-31	120267
2014-06-30	124475
2014-09-30	111134
2014-12-31	112431
2015-03-31	94675
2015-06-30	88077
2015-09-30	91842
2015-12-31	88307