Quarter	Sterling
1997-12-31	600
1998-03-31	781
1998-06-30	1217
1998-09-30	992
1998-12-31	1015
1999-03-31	1089
1999-06-30	1122
1999-09-30	1270
1999-12-31	855
2000-03-31	1332
2000-06-30	1569
2000-09-30	1371
2000-12-31	1425
2001-03-31	1775
2001-06-30	1485
2001-09-30	1730
2001-12-31	2064
2002-03-31	1742
2002-06-30	1610
2002-09-30	2197
2002-12-31	1131
2003-03-31	1482
2003-06-30	2121
2003-09-30	1834
2003-12-31	1453
2004-03-31	1608
2004-06-30	1738
2004-09-30	2269
2004-12-31	3290
2005-03-31	2351
2005-06-30	2170
2005-09-30	2546
2005-12-31	4148
2006-03-31	4600
2006-06-30	3404
2006-09-30	2677
2006-12-31	4249
2007-03-31	4165
2007-06-30	2894
2007-09-30	3283
2007-12-31	4004
2008-03-31	7030
2008-06-30	5290
2008-09-30	6439
2008-12-31	7930
2009-03-31	10690
2009-06-30	7904
2009-09-30	3272
2009-12-31	4058
2010-03-31	4543
2010-06-30	3893
2010-09-30	3624
2010-12-31	6844
2011-03-31	7533
2011-06-30	7976
2011-09-30	9770
2011-12-31	10973
2012-03-31	8966
2012-06-30	6065
2012-09-30	5950
2012-12-31	3799
2013-03-31	4410
2013-06-30	4517
2013-09-30	4545
2013-12-31	7335
2014-03-31	8224
2014-06-30	6074
2014-09-30	6249
2014-12-31	6072
2015-03-31	5630
2015-06-30	4611
2015-09-30	7040
2015-12-31	7645
2016-03-31	7685
2016-06-30	9986
2016-09-30	10686
2016-12-31	11734
2017-03-31	15284
2017-06-30	19412
2017-09-30	17875
2017-12-31	21377
2018-03-31	21002
2018-06-30	20472
2018-09-30	20963
2018-12-31	39919