I'm researching how much is spent annually on public art in the United States. Is it $500 Million? $2 Billion? This metric is just one of several possible metrics that could answer the question: What is the size of our industry? 

I thought I had seen a report on US spending in 2014 from a major foundation, but now I can't find it. Does anyone know of a recent report or study that shows these numbers? I'd also be interested in reports on public art spending in other countries as well.

Thank you for your help!