While there may be tens of thousands of wine producers across the globe, it is estimated that perhaps only 250 produce the sort of premier wines that are worth considering as a financial investment.[8] It is also estimated that about 90 percent of the world's investment grade wine is produced in the Bordeaux region of France, which explains why the region is the main target for investment wine fraudsters.[8] Vintage ports historically have made up much of the rest of the market inventory, but now more and more varied and global selections of wines are finding their way into the investor market.[9]