The chain's 100th restaurant opened in 1963, and by 1965, it expanded internationally, opening its first branch in Canada.[10] "Munchkins", pastries that resemble the center of a doughnut when cut, debuted in 1972. Growth was exponential starting in 1979 when the chain had 1,000 restaurants in 1979, 2,000 in 1990, and 3,000 in 1992. In 1996, bagels were introduced to the Dunkin' Donuts menu and breakfast sandwiches the following year.