Quarter	Sterling
1997-12-31	10902
1998-03-31	11685
1998-06-30	12038
1998-09-30	12451
1998-12-31	13437
1999-03-31	13654
1999-06-30	13698
1999-09-30	13925
1999-12-31	14236
2000-03-31	14398
2000-06-30	14925
2000-09-30	15483
2000-12-31	15366
2001-03-31	15912
2001-06-30	16822
2001-09-30	17347
2001-12-31	17484
2002-03-31	18322
2002-06-30	18916
2002-09-30	19537
2002-12-31	20258
2003-03-31	20741
2003-06-30	20549
2003-09-30	21741
2003-12-31	22656
2004-03-31	22379
2004-06-30	23039
2004-09-30	23239
2004-12-31	24383
2005-03-31	25645
2005-06-30	26869
2005-09-30	27356
2005-12-31	28428
2006-03-31	28812
2006-06-30	30206
2006-09-30	32040
2006-12-31	33331
2007-03-31	34073
2007-06-30	33779
2007-09-30	35219
2007-12-31	36580
2008-03-31	35685
2008-06-30	34834
2008-09-30	34435
2008-12-31	33600
2009-03-31	34507
2009-06-30	35379
2009-09-30	34813
2009-12-31	35714
2010-03-31	35642
2010-06-30	34593
2010-09-30	35373
2010-12-31	35422
2011-03-31	29416
2011-06-30	29668
2011-09-30	30427
2011-12-31	31238
2012-03-31	31259
2012-06-30	32402
2012-09-30	32250
2012-12-31	32339
2013-03-31	32878
2013-06-30	32855
2013-09-30	34286
2013-12-31	35586
2014-03-31	36349
2014-06-30	36950
2014-09-30	38074
2014-12-31	39318
2015-03-31	40192
2015-06-30	40941
2015-09-30	43570
2015-12-31	43804
2016-03-31	44780
2016-06-30	45611
2016-09-30	46089
2016-12-31	46947
2017-03-31	47351
2017-06-30	49448
2017-09-30	50782
2017-12-31	52524
2018-03-31	52412
2018-06-30	53480
2018-09-30	55520
2018-12-31	56643
2019-03-31	55918
2019-06-30	54639
2019-09-30	57353
2019-12-31	56446
2020-03-31	59023
2020-06-30	62265
2020-09-30	64854
2020-12-31	66578
2021-03-31	68055
2021-06-30	69684
2021-09-30	71475
2021-12-31	72201
2022-03-31	74127
2022-06-30	75979
2022-09-30	77473
2022-12-31	74649
2023-03-31	71788
2023-06-30	70909
2023-09-30	71514
2023-12-31	70450