how extended does qqq get from its 50 day average before correcting

QQQ had its best day since March 10, 1999 on April 21, 1999, returning 4%.

ASSETDATE% RETURN
QQQ
3/10/1999
0%
QQQ
3/11/1999
-0.24%
QQQ
3/12/1999
-2.08%
QQQ
3/15/1999
2.11%
QQQ
3/16/1999
0.42%
QQQ
3/17/1999
-0.72%
QQQ
3/18/1999
2.06%
QQQ
3/19/1999
-3.81%
QQQ
3/22/1999
-1.64%
QQQ
3/23/1999
-2.98%
QQQ
3/24/1999
2.47%
QQQ
3/25/1999
2.07%
QQQ
3/26/1999
-0.24%
QQQ
3/29/1999
2.39%
QQQ
3/30/1999
-0.58%
QQQ
3/31/1999
-3.06%
QQQ
4/1/1999
-0.81%
QQQ
4/5/1999
1.97%
QQQ
4/6/1999
0.31%
QQQ
4/7/1999
-1.95%
QQQ
4/8/1999
0.97%
QQQ
4/9/1999
0.79%
QQQ
4/12/1999
1.72%
QQQ
4/13/1999
-1.96%
QQQ
4/14/1999
-4.63%