ArgumentError: flag after precision
from SVG/Graph/Graph.rb:671:in `%'
from SVG/Graph/Graph.rb:671:in `make_datapoint_text'
from SVG/Graph/Line.rb:260:in `block (2 levels) in draw_data'
from SVG/Graph/Line.rb:247:in `each_index'
from SVG/Graph/Line.rb:247:in `block in draw_data'
from SVG/Graph/Line.rb:201:in `each'
from SVG/Graph/Line.rb:201:in `draw_data'
from SVG/Graph/Graph.rb:213:in `burn'
from objects/graph.rb:79:in `svg'
from front/front_rate.rb:157:in `block (2 levels) in <top (required)>'