Excel graph- two bounds on X Axis

I am preparing a budget flow chart, Budget against actual spend as below on X axis.
Month Budget Spent
Jan 20000 0
Feb 20000 19500
Mar 22500 22450
Apr 22500 22480

I could plot the graph but the gap of the line for Feb to march is like overlapping each other unless my graph is big then only can see there is a gap in value for Feb, mar and apr. As I need the graph starting from £0.
I could draw a graph that starting at 19000 then could see the gap of the line. But I need a graph that start from value £0

It is possible to draw a graph that £ value from 20000 to 22500 is in bigger gap? i.e for value 0 to 19000 say 1cm apart, then 19000 to 23000 (instead of 4 cm apart make it 8 cm apart).

I like to attached a pic of graph so that I could explain better but I fail to do so.chart.docx