I have some monthly data that I would like to improve the visualization for.  The data is compared to an SLA or service level agreement.  Let's say it's the number of offspec products.  Below 10 per month - we're within our SLA.  Between 10 and 20 - that's at the warning level.  Above 20 - we clearly breached our SLA and that's a no no.  

The data isn't important here, but I haven't found a great way to make the data representation better.  I've included an attachment that shows the actual data (in dark grey) vs. the "control lines" for good, poor, and bad performance.  The attachment shows the latest suggestion that someone provided for improving the data.  

I have seen Stephen Few's line graphs where he compares data to a single quality target, but my example has 3 such targets.  We considered shading the good, poor, and bad areas with green, yellow and red colors, but that's just too much color in one chart.  

We also considered sparklines, but the end consumer of this data wants to see the actual values.  That data could be shown below the chart if necessary.

Anyone have any other suggestions on plotting data vs. multiple quality targets?

Thanks,

Scotty81