year    observation_id  VarX    VarY
2010    1               0.37
2011    1               0.37
2012    1               0.38
2013    1               0.39
2014    1               0.38    0.28
2015    1               0.37    0.31
2016    1               0.41    0.28
2017    1               0.41    0.33
2018    1               0.41    0.27
2010    2               0.63    0.68
2011    2               0.63    0.67
2012    2               0.63    0.67
2013    2                0.6    0.59
2014    2                0.6    0.63
2015    2               0.62    0.65
2016    2               0.61    0.63
2017    2               0.62    0.63
2018    2               0.62    0.65
2010    3               0.49    0.39
2011    3               0.51    0.39
2012    3               0.51    0.36
2013    3               0.51    0.35
2014    3               0.52    0.33
2015    3               0.53    0.33
2016    3               0.52    0.34
2017    3               0.52    0.38
2018    3               0.52    0.39