Years

i

Y_i insurance liability degree of damage

iY_i

i²

2002

1

0.020

0.020

1

2003

2

0.025

0.050

4

2004

3

0.032

0.096

9

2005

4

0.030

0.120

16

2006

5

0.040

0.200

25

Total

15

0.147

0.486

55