calculating variance with mysql week over week

I need to display week over week difference with mysql in `Week Over Week Users` column. My data looks like the following:
```
Date                 Users          Week Over Week Users
06-01-2019      10                 10
06-08-2019      15                 15
06-15-2019       5                   5
```
Currently, `Week Over Week Users` only reflects the data that I have in `Users` column. The desired output would be:
```
Date                  Users                Week Over Week Users
06-01-2019         10                          10
06-08-2019         15                           5
06-15-2019          5                           -10
```
Basically if on the second week the number of users grew up to 15 users, then I need to display 5 (as in +5 users since last week, so `new week Users - last week Users` would be the formula)

Here is my code:
```
(
SUM(
CASE
WHEN WEEK(`Date`) = WEEK(CURRENT_DATE()) THEN `Users`
ELSE 0
END
) - SUM(
CASE
WHEN WEEK(`Date`) = WEEK(CURRENT_DATE()) - 1 THEN `Users`
ELSE 0
END
)
)
```
But it doesn't work as it duplicates the Users column.