set xdata time
set timefmt "%Y-%m-%d"
set style fill solid 0.75 border
set format x "%m/%Y"
#set yrange [ -50 : 20000 ]
set terminal png size 1200, 800
set terminal png 
set output "pocet-nodu.png"
plot "celkove.txt" using 1:2 title "Vyvoj poctu nodu v OpenStreetMap (CZ)" with boxes