So, when did Subway start having drive-up windows?

Driving back from Indiana, i noticed a new Subway had opened in Henderson, Kentucky. being hungry and a new establishment, wife and i drove in for our favorite “veggie sub sandwich”. since we were late, heading for home, we decided to eat our sub on the way. as i was backing out of Subways parking lot, i noticed a line of cars wrapped around its building. being curious, i ventured to see what was happening. it was a drive-up window at this new Subway. this was a first for us. how long has Subway Sandwich Shops had drive-up windows and which was the first in the nation?