Quarter	Percent
1999-07-01	23.9152884826479
1999-10-01	24.0553489794154
2000-01-01	24.4382990675935
2000-04-01	23.7501916142352
2000-07-01	25.3682014856521
2000-10-01	24.9743784039076
2001-01-01	23.9073496759601
2001-04-01	24.7116531177996
2001-07-01	25.1557649845440
2001-10-01	24.0499130375082
2002-01-01	25.9339277145484
2002-04-01	25.9271114274266
2002-07-01	26.1774924060919
2002-10-01	25.3779927432743
2003-01-01	24.9592452358599
2003-04-01	24.2500480339030
2003-07-01	25.6845259235277
2003-10-01	25.7035906801475
2004-01-01	25.9827760600207
2004-04-01	25.1753702658877
2004-07-01	25.7241904906910
2004-10-01	26.2309793002498
2005-01-01	24.9896088633756
2005-04-01	23.9903012294402
2005-07-01	24.2240706139408
2005-10-01	22.8130637527231
2006-01-01	22.7696132621987
2006-04-01	22.3978305973955
2006-07-01	22.8660556470428
2006-10-01	21.0767938011906
2007-01-01	21.9504377571750
2007-04-01	21.1193513218425
2007-07-01	21.5406608246292
2007-10-01	20.5927369834077
2008-01-01	19.3936635219185
2008-04-01	19.3098683461866
2008-07-01	19.0762886717005
2008-10-01	16.8982455959829
2009-01-01	16.5484924431274
2009-04-01	17.7270039214728
2009-07-01	19.1375327684189
2009-10-01	17.6591262074922
2010-01-01	17.3180724186088
2010-04-01	17.1390368469505
2010-07-01	18.2989689303065
2010-10-01	18.1774091333142
2011-01-01	18.3949450573278
2011-04-01	18.1895612303965
2011-07-01	18.7277147534510
2011-10-01	18.5339740658304
2012-01-01	19.9356088755681
2012-04-01	19.5068736453475
2012-07-01	20.4851894136706
2012-10-01	19.2243327823248
2013-01-01	19.4349370253069
2013-04-01	19.5985622519166
2013-07-01	20.6368977261028
2013-10-01	20.6036363349170
2014-01-01	21.5961575404143
2014-04-01	20.6466563935137
2014-07-01	22.7713503879835
2014-10-01	21.6813092306446
2015-01-01	22.4790975894264
2015-04-01	22.8353709601911
2015-07-01	23.3009726428706
2015-10-01	22.6728282338556
2016-01-01	22.2081618514088
2016-04-01	23.2050084852920
2016-07-01	23.6381448068827
2016-10-01	22.7611027015918
2017-01-01	22.6347692897722
2017-04-01	23.8139185459970
2017-07-01	23.9982408390081
2017-10-01	22.0793566491078
2018-01-01	22.1159617001906
2018-04-01	21.4843322379856
2018-07-01	21.8270817832246