% ti  yi 
 3.1  4.7
 4.3  5.4
 5.6  6.3
 6.8  6.2
 8.1  5.0
 9.3  4.6
10.6  4.6 
11.8  6.0
13.1  6.1
14.3  4.8
15.6  3.9
16.8  4.3
18.1  5.4