How are curling accuracy percentages calculated?

When I was up in Vancouver for the Olympics, the TV announcers for the curling matches would occasionally say "she is throwing .835" or "his accuracy is .768". How is this accuracy rating calculated? I can find no reference to accuracy anywhere, even at the international curling federation... show more When I was up in Vancouver for the Olympics, the TV announcers for the curling matches would occasionally say "she is throwing .835" or "his accuracy is .768". How is this accuracy rating calculated? I can find no reference to accuracy anywhere, even at the international curling federation website.

And yes, I got to see Madeleine Dupont on the sheet, be still my beating heart.
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