Sample bubble chart

read "ef2015.csv"
extend jahr = 2015
read "ef2019.csv"
extend jahr = 2019
union
project inline kanton, jahr, fiktive_waehlende sum
extend wahlanteil = fiktive_waehlende / fiktive_waehlende_sum
select partei == "GPS"
dup
project kanton, jahr, wahlanteil
deserialize
swap
project kanton, fiktive_waehlende_sum avg
// scale bubbles to pixels
update fiktive_waehlende_sum_avg = fiktive_waehlende_sum_avg / 20000
join natural
label _2015 "GPS"
delegate "bubblechart -colors green"
print