Quarter	Percent
1999-01-01	12.28952868515600
2000-01-01	16.75774664263710
2000-04-01	16.31291936636770
2000-07-01	15.38364302869420
2000-10-01	15.97015529188750
2001-01-01	18.24848309737070
2001-04-01	18.37363543683200
2001-07-01	17.85789753225320
2001-10-01	18.49287239970280
2002-01-01	20.26138844418570
2002-04-01	19.89485703686960
2002-07-01	19.83595580850350
2002-10-01	19.73866607396660
2003-01-01	20.52715559842340
2003-04-01	19.36944649446490
2003-07-01	19.31940922325540
2003-10-01	19.26255076216820
2004-01-01	20.67126983939950
2004-04-01	19.07257349027030
2004-07-01	18.19427527405600
2004-10-01	17.97537779333680
2005-01-01	18.85572491188360
2005-04-01	18.04816997573290
2005-07-01	17.36400469624070
2005-10-01	16.74284854656540
2006-01-01	16.08004904849490
2006-04-01	14.05747570507300
2006-07-01	13.03929290277410
2006-10-01	12.21875551892620
2007-01-01	11.31980757163770
2007-04-01	9.55896835960582
2007-07-01	9.02643911928552
2007-10-01	8.52520590365063
2008-01-01	8.06361772478934
2008-04-01	7.08376023831662
2008-07-01	6.61355884689062
2008-10-01	6.72304168682142
2009-01-01	8.25422402821079
2009-04-01	7.87775555762255
2009-07-01	8.05656751097214
2009-10-01	8.47693947512459
2010-01-01	10.59322533136970
2010-04-01	9.52648160812714
2010-07-01	9.13321125585276
2010-10-01	9.30846722477439
2011-01-01	10.03988777536330
2011-04-01	9.44193535261943
2011-07-01	9.32501516333074
2011-10-01	9.72442265215732
2012-01-01	10.51138840295010
2012-04-01	9.88908840018245
2012-07-01	9.85097391613484
2012-10-01	10.10383248818520
2013-01-01	11.27950425882520
2013-04-01	10.44862184292470
2013-07-01	9.82208852599914
2013-10-01	9.76426335888822
2014-01-01	10.59979792412970
2014-04-01	9.11962895401631
2014-07-01	8.15440827505761
2014-10-01	8.08965295629820
2015-01-01	8.62054042825737
2015-04-01	7.41939780736554
2015-07-01	7.05550275395344
2015-10-01	6.91687965647174
2016-01-01	6.98701117642958
2016-04-01	6.17926716141002
2016-07-01	5.93725603585369
2016-10-01	5.54327829779356
2017-01-01	5.38376154306602
2017-04-01	4.97096573495864
2017-07-01	4.71801560552195
2017-10-01	4.47621265940721
2018-01-01	4.15760184365306
2018-04-01	3.59086279644988