The first one starts from 5.5 which makes it look nearly identical to that in the blog post

https://i.imgur.com/n0LZJd8.png

The second one is where I let the y-axis run from 0 to 10 instead of from 5.5 to 10. In my opinion, this changes very little

https://i.imgur.com/cmrnbDp.png

The third one is with the y-axis from 0 to 100 which makes the effect significantly less pronounceable

https://i.imgur.com/pk9Bs9n.png

Matlab code:

    m = 1:12;
    tasks = [7.2 7.6 8.3 8.1 8.2 8.4 8.6 8.4 8.8 9.5 9.0 8.0];
    bar(m,tasks);

    % axis([0 12.5 0 100]);
    % axis([0 12.5 0 10]);
    axis([0 12.5 5.5 10]);

    title('In which month do people complete most tasks');
    xlabel('Month');
    ylabel('Percentage people reporting completing most tasks');