Why now many pay searches engine bid low pity?

Type of Payment Quantity Earnings
Date: 05/18/2004 Clicks By Referrals 81 $0.4543
, ?, S/ f! i5 a8 XDate: 05/19/2004 Clicks By Referrals 141 $0.483
1 b# j6 \- e! n/ m) x* O9 |1 gDate: 05/26/2004 Clicks By Referrals 64 $0.1235
# m2 V" D6 m0 ^/ T8 b+ u7 P+ s( y
8 J! k  e9 J% N6 H
Why now many pay searches engine bid low pity?And has the more and more low tendency! Worried!