Quarter	Units, Seasonally Adjusted
2003-01-01	17611.87017257720
2003-04-01	16974.52051314310
2003-07-01	17622.40795154790
2003-10-01	17378.07756589630
2004-01-01	16654.02156433400
2004-04-01	18359.47834098160
2004-07-01	16696.48581923690
2004-10-01	16847.14151992420
2005-01-01	15630.18433453350
2005-04-01	16405.88924462920
2005-07-01	17062.82641973680
2005-10-01	17263.56703078240
2006-01-01	16421.54605865630
2006-04-01	16543.72673637830
2006-07-01	15105.33731493280
2006-10-01	14842.27676213100
2007-01-01	15023.41059285480
2007-04-01	13778.00655333530
2007-07-01	15399.35663585060
2007-10-01	13440.60994899390
2008-01-01	14334.37347314930
2008-04-01	13450.23651237870
2008-07-01	13185.80248029520
2008-10-01	10372.10140312720
2009-01-01	8007.38838547528
2009-04-01	5407.05812367439
2009-07-01	3178.89450646791
2009-10-01	3567.08740440750
2010-01-01	3550.62020586803
2010-04-01	3569.60041168237
2010-07-01	3793.43712070464
2010-10-01	3555.20107523438
2011-01-01	3995.05759273878
2011-04-01	3695.24793198262
2011-07-01	3758.65702974991
2011-10-01	3692.62294003867
2012-01-01	4861.23811023269
2012-04-01	4336.06680957949
2012-07-01	4106.38605248753
2012-10-01	4475.94753693342
2013-01-01	4349.31531734450
2013-04-01	4563.23900602554
2013-07-01	4887.33672166165
2013-10-01	4918.45269506479
2014-01-01	5402.98864064010
2014-04-01	5433.50212955610
2014-07-01	5736.39896839687
2014-10-01	5882.48397960948
2015-01-01	6036.44999880987
2015-04-01	6149.68117097768
2015-07-01	6364.29829173167
2015-10-01	7089.62696320045
2016-01-01	6910.19484182371
2016-04-01	8070.40966250997
2016-07-01	8235.03605662967
2016-10-01	8809.67163939065
2017-01-01	8580.63382839753
2017-04-01	9335.49267077231
2017-07-01	9932.68071944770
2017-10-01	10843.29781428010
2018-01-01	11244.88953045920
2018-04-01	11993.96812684490
2018-07-01	12097.64091768020