1850_215_pert   1850_215
    0       2.15      2.22
    1      18.01     10.50
    2       0.07     -0.49
    3      25.90     24.25
    4      -0.20     -0.91
    5      14.69      9.76
    6      -0.03     -0.58
    7      19.23     11.53
    8       0.08     -0.31
    9      16.05     13.16
   10       0.27     -0.30
   11      20.44     21.82
   12      84.85     85.23