The Performance analysis calculates the change from the observation that is before the specified start date. In other words, the observation prior to the start date is the value “0”.
If you want a performance chart that starts with 0 as the first value, you can use the Rebase analysis combined with the arithmetic analysis, where you will subtract the base value.
We rebased SEK series to start of year and subtracted 100 from the series. Then we started your chart at 2019 to get YTD value.
You’ll find more information on using the Performance analysis here.