Hi
I have a simple salesamount by period and need to calculate a seasonality (% of yearly total). A sample of Sales:
| Period | Amount |
| 2015-12-01 | 275 |
| 2016-01-01 | 20 |
| 2016-02-01 | 30 |
| 2016-03-01 | 32 |
| 2016-04-01 | 21 |
| 2016-05-01 | 17 |
| 2016-06-01 | 54 |
| 2016-07-01 | 23 |
| 2016-08-01 | 34 |
| 2016-09-01 | 21 |
| 2016-10-01 | 18 |
| 2016-11-01 | 19 |
| 2016-12-01 | 21 |
| 2017-01-01 | 32 |
| 2017-02-01 | 12 |
I have a relation between Sales and Dim Time. I need to get the % of year like this:
| Period | Amount | % of year |
| 2015-12-01 | 275 | 100,00% |
| 2016-01-01 | 20 | 6,45% |
| 2016-02-01 | 30 | 9,68% |
| 2016-03-01 | 32 | 10,32% |
| 2016-04-01 | 21 | 6,77% |
| 2016-05-01 | 17 | 5,48% |
| 2016-06-01 | 54 | 17,42% |
| 2016-07-01 | 23 | 7,42% |
| 2016-08-01 | 34 | 10,97% |
| 2016-09-01 | 21 | 6,77% |
| 2016-10-01 | 18 | 5,81% |
| 2016-11-01 | 19 | 6,13% |
| 2016-12-01 | 21 | 6,77% |
| 2017-01-01 | 32 | 10,70% |
Any guidance ...