Label is displayed on other label

[omri6846]

I tried to draw venn with the following data:
var sets = [ {sets: ['A'], size: 50, label: '50'},
{sets: ['B'], size: 50, label: '50'},
{sets: ['C'], size: 50, label: '50'},
{sets: ['A','B'], size: 31, label: '31'},
{sets: ['A','C'], size: 20, label: '20'},
{sets: ['B','C'], size: 10, label: '10'},
{sets: ['A','B', 'C'], size: 1, label: '1'}];

And I got this venn:

how can I fix that 1 and 10 in the same location?