Data          [1]      [2]      [3]      [4]
bal. 15      87.5      6.9        4      1.6
bal. 16      86.2      9.2      2.7        2
bal. 17      87.4      7.2      3.2      2.2
bal. 18      85.4      8.9      3.7      1.9
bal. 19      86.4        8      3.3      2.3
bal. 20      86.6      7.6      3.2      2.6
bal. 21      87.8        6      3.5      2.7
bal. 22      87.2      6.2      4.2      2.4
bal. 23        87      6.3      4.2      2.6
bal. 24      86.2        8      3.3      2.5
bal. 25      86.5      7.1      2.9      3.5
bal. 26      86.6      7.3      2.8      3.2
bal. 27      86.8      7.2        3        3
bal. 28      87.5      6.5      3.8      2.2
bal. 29      86.7      7.5      3.5      2.3
bal. 30      87.2      7.7      2.6      2.6
geg. 1       89.2      5.2      3.7      1.9
geg. 2       88.2      5.7      4.2        2
geg. 3       86.1        8      3.5      2.4
geg. 4       88.2      6.1      3.2      2.5
geg. 5       89.1      5.8      2.5      2.5
geg. 6       87.7      7.6      2.2      2.5
geg. 7       85.9      8.5      3.1      2.5
geg. 8       86.4        7      4.5        2
geg. 9       86.4      6.7      4.8      2.2
geg. 10      86.3      6.6      4.7      2.4
geg. 11      86.1      6.7      4.7      2.5
geg. 12      86.6      7.6      3.2      2.7
geg. 13      87.4      6.9      2.9      2.9
geg. 14      85.7      8.1      3.2        3
geg. 15      85.6      7.5      4.3      2.6