(CNN) -- Here is some background information about Father's Day, celebrated the third Sunday in June.
Facts: June 15, 2014 - Father's Day.
Father's Day is the fourth-largest card-sending occasion with 87 million cards given every year.
Fifty percent of all Father's Day cards are purchased for fathers. Almost 15 percent of Father's Day cards are given to husbands.
Two top-selling categories are "Dad from Daughter" and "Dad From Both."
The United States Census Bureau estimates there were 70.1 million fathers in the U.S. in 2008, and 189,000 stay-at-home dads in 2012 taking care of children while a spouse worked outside the home.
Sonora Louise Smart Dodd of Spokane, Wash., is credited with starting Father's Day after hearing a sermon on Mother's Day.
Dodd wanted to honor her father William Jackson Smart, a widower who raised six children on his own.
Timeline: 1910 - Spokane celebrated the first Father's Day on June 19, the anniversary of William Jackson Smart's birthday.
1924 - President Calvin Coolidge publicly supported plans for a national Father's Day.
1966 - President Lyndon Johnson proclaimed Father's Day to be an official national holiday.
1972 - President Richard Nixon signed into law a permanent U.S. Father's Day to be observed on the third Sunday of June.