Aggregate the values for each month in line chart instead of individual points

[Saurabh07]

Hello Gurus,

I am facing a issue in Qlik Line chart. I have mentioned data:

Country	Date	Value
India	01-01-2020	10
India	02-01-2020	17
India	03-01-2020	14
India	04-01-2020	20
India	01-02-2020	13
India	02-02-2020	11
India	03-02-2020	12
India	04-02-2020	11
India	01-03-2020	20
India	02-03-2020	11
India	03-03-2020	11
India	04-03-2020	15
India	01-04-2020	15
India	02-04-2020	11
India	03-04-2020	11
India	04-04-2020	12
Germany	01-01-2020	11
Germany	02-01-2020	11
Germany	03-01-2020	13
Germany	04-01-2020	18
Germany	01-02-2020	11
Germany	02-02-2020	11
Germany	03-02-2020	11
Germany	04-02-2020	18
Germany	01-03-2020	11
Germany	02-03-2020	18
Germany	03-03-2020	20
Germany	04-03-2020	14
Germany	01-04-2020	20
Germany	02-04-2020	16
Germany	03-04-2020	14
Germany	04-04-2020	10
Italy	01-01-2020	15
Italy	02-01-2020	14
Italy	03-01-2020	20
Italy	04-01-2020	16
Italy	01-02-2020	16
Italy	02-02-2020	16
Italy	03-02-2020	12
Italy	04-02-2020	11
Italy	01-03-2020	20
Italy	02-03-2020	17
Italy	03-03-2020	20
Italy	04-03-2020	19
Italy	01-04-2020	12
Italy	02-04-2020	10
Italy	03-04-2020	19
Italy	04-04-2020	11

So what I want to see in line chart is basically the trend of values for each month. But below is the output I am getting. Instead of getting cumulative value for each month, the data is getting plotted for each date. Basically I need only one point for each month instead of 4.

For months I want to see only past 3 month trend from the selected month. Below is the expression I am using but somehow it does'nt work:

sum({<Date={">=$(=addmonths(max(Date),-2))<=$(=addmonths(max(Date),0))"}>}Value)

Any help here would be highly appreciated.