I have a data set where the targets are set at the start of the year and as the year progresses actuals are loaded (through Webform) which appear on a different row. I am trying to calculate the performance each month (Actuals / Target) but I dont know how to calculate this when the values are on different rows. I'm sure there is an easy workaround to join the data according to the month / Year column
| Month/Year | Actuals | Target |
| Jan-15 | | 20 |
| Feb-15 | | 30 |
| Mar-15 | | 40 |
| Apr-15 | | 50 |
| May-15 | | 60 |
| Jun-15 | | 70 |
| Jan-15 | 130 | |
| Feb-15 | 140 | |
| Mar-15 | 150 | |
| Apr-15 | 160 | |
| May-15 | 170 | |
| Jun-15 | 180 | |
thanks in anticipation