In 2013, Napa wineries shipped more than 1.1 million cases of wine direct to consumers who are lucky enough to live in states where that is legal. Of the total, less than half of one percent was Sangiovese. I would have guessed an even smaller percentage, since Villa Ragazzi accounted for only 2% of the Sangiovese shipped direct, or 0.00009 of the million+ cases.
If you got some Villa Ragazzi Sangiovese (or Faraona, or Rosato) last year, congratulations on being part of an elite group able to ferret out scarce wine treasures. For while the data is nearly infinitesimal, the pleasure Napa Valley Sangiovese offers is immeasurable.