How to create a chart that shows a decrease over time without a date variable

CC__123 -

Unpivot your table using Power Query:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WCkgtKs7PUzBU0lHCxLE6cAVGWBQYICswRpGAYSQFJoRMMCXkBjMM48EmxAIA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type text) meta [Serialized.Text = true]) in type table [Person = _t, #"Period 1" = _t, #"Period 2" = _t, #"Period 3" = _t, #"Period 4" = _t, #"Period 5" = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Person", type text}, {"Period 1", Int64.Type}, {"Period 2", Int64.Type}, {"Period 3", Int64.Type}, {"Period 4", Int64.Type}, {"Period 5", Int64.Type}}),
    #"Unpivoted Columns" = Table.UnpivotOtherColumns(#"Changed Type", {"Person"}, "Attribute", "Value")
in
    #"Unpivoted Columns"

then write a measure as:

Measure = DIVIDE(CALCULATE(SUM('Table'[Value]),ALLEXCEPT('Table','Table'[Attribute])),COUNTROWS('Table'))

format as 'Percentage' > should return as: