Where did you order them from?
The majority are PG based, though places like NudeNicotine and a few others do make flavors with VG & Alcohol as a base. The vast majority from the likes of FlavorWest, The Flavor Apprentice (with exception of a few), FlavourArt, Inawera, Capellas and similar will use a PG base. Some are PG & Alcohol as well, just depends on the flavor.
That being said, when you calculate them in using an e-liquid calculator, you count them as 100% PG or VG essentially. There's no % PG to % Flavor that comes on the package and that mix ratio is most likely proprietary.