Why now many pay searches engine bid low pity?

Type of Payment Quantity Earnings
2 V; i3 i  m) w* U2 A  t4 bDate: 05/18/2004 Clicks By Referrals 81 $0.4543
Date: 05/19/2004 Clicks By Referrals 141 $0.483
- G9 C! t, \7 v% sDate: 05/26/2004 Clicks By Referrals 64 $0.1235
+ d- E( @" q! Q5 Y$ A1 q+ n! r
9 ?( P' `  d" U) P
Why now many pay searches engine bid low pity?And has the more and more low tendency! Worried!