Quarter	Sterling
1997-12-31	7950
1998-03-31	7189
1998-06-30	6591
1998-09-30	7190
1998-12-31	8660
1999-03-31	7055
1999-06-30	7284
1999-09-30	7523
1999-12-31	9955
2000-03-31	7675
2000-06-30	7751
2000-09-30	8007
2000-12-31	9358
2001-03-31	7633
2001-06-30	8445
2001-09-30	8619
2001-12-31	11166
2002-03-31	8865
2002-06-30	8408
2002-09-30	9478
2002-12-31	11310
2003-03-31	9011
2003-06-30	9994
2003-09-30	10189
2003-12-31	12768
2004-03-31	10676
2004-06-30	11572
2004-09-30	11295
2004-12-31	12754
2005-03-31	10006
2005-06-30	9741
2005-09-30	9898
2005-12-31	12268
2006-03-31	9815
2006-06-30	10823
2006-09-30	10393
2006-12-31	12530
2007-03-31	10537
2007-06-30	11151
2007-09-30	10908
2007-12-31	13878
2008-03-31	11686
2008-06-30	10819
2008-09-30	10567
2008-12-31	12969
2009-03-31	11228
2009-06-30	11474
2009-09-30	11018
2009-12-31	14393
2010-03-31	11567
2010-06-30	11418
2010-09-30	10927
2010-12-31	12738
2011-03-31	11783
2011-06-30	12187
2011-09-30	11396
2011-12-31	14575
2012-03-31	11728
2012-06-30	12628
2012-09-30	12216
2012-12-31	15355
2013-03-31	12588
2013-06-30	13617
2013-09-30	14141
2013-12-31	17750
2014-03-31	15788
2014-06-30	15837
2014-09-30	16551
2014-12-31	22456
2015-03-31	20414
2015-06-30	16584
2015-09-30	16487
2015-12-31	21306
2016-03-31	17861
2016-06-30	18473
2016-09-30	17998
2016-12-31	22475
2017-03-31	18679
2017-06-30	19761
2017-09-30	20026
2017-12-31	23696
2018-03-31	20256
2018-06-30	21645
2018-09-30	21004
2018-12-31	26175
2019-03-31	22202
2019-06-30	23687
2019-09-30	24024
2019-12-31	27612
2020-03-31	26567
2020-06-30	34753
2020-09-30	35593
2020-12-31	42187
2021-03-31	36186
2021-06-30	39907
2021-09-30	39147
2021-12-31	40546
2022-03-31	34964
2022-06-30	34767
2022-09-30	31894
2022-12-31	35014
2023-03-31	31378
2023-06-30	31634
2023-09-30	31259
2023-12-31	31756