Also, I just took a peek at your data and I have some recommendations. Right now this is the data you're returning:
{
"june": 18.09712,
"march": 14.75367,
"january": 14.19348,
"october": 17.17266,
"april": 16.92614,
"february": 14.49611,
"august": 16.51558,
"may": 18.0044
}
This will work fine...