Quarter	Percent
1981-03-31	16.8469
1981-06-30	17.6834
1981-09-30	18.3818
1981-12-31	14.3643
1982-03-31	15.0337
1982-06-30	15.0645
1982-09-30	12.5663
1982-12-31	9.8882
1983-03-31	9.1677
1983-06-30	9.3473
1983-09-30	10.0779
1983-12-31	9.8512
1984-03-31	10.0909
1984-06-30	11.4248
1984-09-30	11.8731
1984-12-31	9.8326
1985-03-31	8.9584
1985-06-30	8.1855
1985-09-30	8.0711
1985-12-31	8.083
1986-03-31	7.8505
1986-06-30	6.9227
1986-09-30	6.228
1986-12-31	6.0783
1987-03-31	6.3156
1987-06-30	7.0944
1987-09-30	7.1626
1987-12-31	7.9001
1988-03-31	6.8996
1988-06-30	7.4243
1988-09-30	8.3435
1988-12-31	8.9546
1989-03-31	9.7946
1989-06-30	9.7208
1989-09-30	8.8896
1989-12-31	8.5868
1990-03-31	8.3701
1990-06-30	8.4257
1990-09-30	8.1348
1990-12-31	8.0625
1991-03-31	6.849
1991-06-30	6.1335
1991-09-30	5.8188
1991-12-31	5.0322
1992-03-31	4.1888
1992-06-30	3.9815
1992-09-30	3.3511
1992-12-31	3.5547
1993-03-31	3.2154
1993-06-30	3.2092
1993-09-30	3.1982
1993-12-31	3.3581
1994-03-31	3.5203
1994-06-30	4.4228
1994-09-30	4.9033
1994-12-31	5.886
1995-03-31	6.2377
1995-06-30	6.053
1995-09-30	5.8142
1995-12-31	5.7636
1996-03-31	5.3362
1996-06-30	5.4357
1996-09-30	5.512
1996-12-31	5.4742
1997-03-31	5.5027
1997-06-30	5.7283
1997-09-30	5.6435
1997-12-31	5.7627
1998-03-31	5.6077
1998-06-30	5.619
1998-09-30	5.5441
1998-12-31	5.2222
1999-03-31	4.933
1999-06-30	5.0013
1999-09-30	5.4006
1999-12-31	6.1042
2000-03-31	6.0646
2000-06-30	6.6034
2000-09-30	6.6571
2000-12-31	6.6309
2001-03-31	5.2909
2001-06-30	4.1119
2001-09-30	3.4102
2001-12-31	2.1046
2002-03-31	1.8582
2002-06-30	1.8747
2002-09-30	1.7728
2002-12-31	1.5294
2003-03-31	1.2814
2003-06-30	1.189
2003-09-30	1.0902
2003-12-31	1.1246
2004-03-31	1.0707
2004-06-30	1.2628
2004-09-30	1.7239
2004-12-31	2.2673
2005-03-31	2.8095
2005-06-30	3.2515
2005-09-30	3.7504
2005-12-31	4.3113
2006-03-31	4.7486
2006-06-30	5.1975
2006-09-30	5.3976
2006-12-31	5.3305
2007-03-31	5.3185
2007-06-30	5.3176
2007-09-30	5.4455
2007-12-31	5.0389
2008-03-31	3.2712
2008-06-30	2.934
2008-09-30	3.1941
2008-12-31	3.4807
2009-03-31	1.5241
2009-06-30	1.0814
2009-09-30	0.7025
2009-12-31	0.442
2010-03-31	0.412
2010-06-30	0.668
2010-09-30	0.5987
2010-12-31	0.4426
2011-03-31	0.4313
2011-06-30	0.3753
2011-09-30	0.3929
2011-12-31	0.4746
2012-03-31	0.427
2012-06-30	0.4588
2012-09-30	0.4432
2012-12-31	0.3511
2013-03-31	0.4088
2013-06-30	0.3768
2013-09-30	0.3051
2013-12-31	0.2468
2014-03-31	0.2403
2014-06-30	0.2569
2014-09-30	0.3092
2014-12-31	0.3092
2015-03-31	0.3852
2015-06-30	0.3519
2015-09-30	0.4485
2015-12-31	0.674
2016-03-31	0.7649
2016-06-30	0.8146
2016-09-30	0.9102
2016-12-31	0.9307
2017-03-31	1.0652
2017-06-30	1.1911
2017-09-30	1.338
2017-12-31	1.5087
2018-03-31	2.0033
2018-06-30	2.3884
2018-09-30	2.395
2018-12-31	2.6652
2019-03-31	2.7062
2019-06-30	2.5148
2019-09-30	2.2042
2019-12-31	1.9309
2020-03-31	1.5119
2020-06-30	0.4989
2020-09-30	0.2014
2020-12-31	0.1912
2021-03-31	0.1908
2021-06-30	0.1666