Quarter	Units, Seasonally Adjusted
1998-01-01	5555.55251616274
1998-04-01	6203.94033849990
1998-07-01	6457.00874037931
1998-10-01	6803.66294897190
1999-01-01	7394.87008117276
1999-04-01	9474.21493949229
1999-07-01	5227.44826945656
1999-10-01	6002.62880132194
2000-01-01	4882.61057306444
2000-04-01	5802.32091115369
2000-07-01	5566.05421779368
2000-10-01	5124.15987830525
2001-01-01	5266.22670258256
2001-04-01	5375.77942261810
2001-07-01	5192.06384114976
2001-10-01	4837.14550617989
2002-01-01	5186.88473306582
2002-04-01	4864.27011805478
2002-07-01	5161.35226972763
2002-10-01	5244.37810422688
2003-01-01	5538.63668538669
2003-04-01	5992.95918498837
2003-07-01	5878.08939550949
2003-10-01	6614.48412572144
2004-01-01	6463.24497226944
2004-04-01	6487.31128489210
2004-07-01	6618.40635834384
2004-10-01	6619.65029200932
2005-01-01	6533.61735662071
2005-04-01	6879.83019407791
2005-07-01	6546.82863664264
2005-10-01	6569.17933103297
2006-01-01	6822.78454027191
2006-04-01	6700.01549862986
2006-07-01	6796.02268690518
2006-10-01	6926.27772906887
2007-01-01	7301.48695236968
2007-04-01	7865.72470638719
2007-07-01	8003.88316889582
2007-10-01	8338.75188527975
2008-01-01	8008.78636771152
2008-04-01	8256.79222887334
2008-07-01	7852.08300241115
2008-10-01	7131.21537787797
2009-01-01	6527.58978417936
2009-04-01	6512.91287711956
2009-07-01	6878.21174338943
2009-10-01	6874.50631668161
2010-01-01	6624.24265660530
2010-04-01	6423.29239133954
2010-07-01	6408.19514269850
2010-10-01	6189.57868831463
2011-01-01	6432.38409635479
2011-04-01	6013.16013673461
2011-07-01	5953.89311504346
2011-10-01	5818.00420293109
2012-01-01	5569.36948187295
2012-04-01	5339.20746340600
2012-07-01	5035.21715822000
2012-10-01	4936.58387053776
2013-01-01	5164.33521298865
2013-04-01	5809.63806935687
2013-07-01	5547.56718857598
2013-10-01	5433.70779957886
2014-01-01	5647.15943833868
2014-04-01	5666.40908665202
2014-07-01	6106.39966009921
2014-10-01	6519.77320195533
2015-01-01	6603.91318149756
2015-04-01	6445.30898718641
2015-07-01	6968.10784173019
2015-10-01	7149.98851062891
2016-01-01	7121.49577178951
2016-04-01	7465.60348404227
2016-07-01	7539.67405734304
2016-10-01	7914.64829290834
2017-01-01	8177.47908397432
2017-04-01	8270.04520979834
2017-07-01	8435.85564799836
2017-10-01	9034.18185609018
2018-01-01	8919.68850158173
2018-04-01	9029.01283257781