Question: When did Michael James Delligatti's food creation go nationwide? 

Context paragraphs:
Big Mac: The Big Mac is a hamburger sold by international fast food restaurant chain McDonald's.  It was introduced in the Greater Pittsburgh area, United States, in 1967 and nationwide in 1968.  It is one of the company's signature products.

Seputar Indonesia: Seputar Indonesia (Around Indonesia), is the Indonesia's longest running flagship newscast carried by a private television station.  It appeared on RCTI on 15 November 1989 as Seputar Jakarta (Around Jakarta) before it evolved to go nationwide on 15 November 1990.  Since the end of 2005, the program has regained its position as the most-watched newscast in the country, according to ratings by Nielsen Media Research.  During its early years, Seputar Indonesia was also carried by RCTI's then sister station SCTV.

Mike Sullivan (golfer): Michael James Sullivan (born January 1, 1955) is an American professional golfer who has played on the PGA Tour, Nationwide Tour and Champions Tour.

Michael Marin: Michael James Marin (December 1958 – June 28, 2012), was an American financier, lawyer and ex-Wall Street trader and millionaire.  He was raised in Oak Harbor, north of Seattle, Washington State.  As a member of The Church of Jesus Christ of Latter-day Saints, he attended Brigham Young University and served in a mission in Japan, where he learned Japanese.  After college, he attended Yale Law School, and was admitted to the New York State Bar Association in 1987.  He went to work in the legal department of banks, which sent him back to Japan.  He made a fortune trading in complex investments in the 1980s and 1990s, working for Lehman Brothers, Merrill Lynch and Salomon Brothers mainly in their operations in Asia.  His children were raised in Asia and in Chicago.  His wife, Tammy, left him in 1992, after 12 years of marriage.  In the late 1990s, Marin returned to the United States, after being let go by Lehman Brothers in 1997.  He led a lavish life buying a multimillion-dollar home in Arizona, also acquiring works of art including Pablo Picasso etchings.  He traveled extensively in Asia.  A book he wrote under the title "Fluctuations" about investment banking in Asia tells about his adventures in Papua New Guinea, Cambodia and Malaysia.  He was an avid thrill seeker and climbed the highest peaks on six of the continents including Mount Everest, engaging in trips and adventures into exotic places.

Nuansa Pagi: Nuansa Pagi (lit.  "Morning Nuance") is the first morning newscast ever produced by a private television station in Indonesia.  "Nuansa Pagi" was introduced by RCTI at 17 January 1993 as Buletin Pagi ('Morning Bulletin') before it evolved to go nationwide on 24 August 1993 as Nuansa Pagi ('Morning Nuance') and since then has become one of the strongest morning shows in the country, according to Nielsen Media Research, Nuansa Pagi was also carried by RCTI's then sister station SCTV (1993-1996).

Go Green Racing: Go Green Racing was an American stock car racing team that debuted in NASCAR competition in 2009, competing in the Nationwide Series, before adding a part-time Sprint Cup Series team in 2012.  The team, which raced with 14 different drivers in the 2011 season, is headquartered in Old Orchard Beach, Maine, but operates from a shop in Mooresville, North Carolina.  The team most recently fielded the No. 79 Uponor Ford Mustang for Jeffrey Earnhardt in the Nationwide Series in 2013.  In 2014, St. Hilaire closed down his Nationwide Series operation to merge the team into Go FAS Racing with Frank Stoddard.

Michael James Genovese: Michael James Genovese (April 9, 1919 – October 31, 2006) was an alleged boss of the Pittsburgh crime family.  References to Michael Genovese as the brother of Vito Genovese are to a different Michael Genovese; Michael James Genovese was first cousin to New York mob boss Vito Genovese.

Michael James Down: Michael James Down is a songwriter and singer from Belfast, Northern Ireland.  He is best known as a composer and lyricist of several pop songs performed by other artists, most of them in national pre-selections of the Eurovision Song Contest, as well as having released a few songs of his own.  As Michael James he released his first digital single "Take My Body Close" in 2014, later followed by a videoclip.  He was also featured on the 2014 summer single "Summer Sun" by Royo & B.O.X

Michael Cox (singer): Michael James Cox (born 19 March 1940) is a British-born former pop singer and actor.  As Michael Cox, he had a top ten hit on the UK singles chart in 1960 with "Angela Jones", produced by Joe Meek.  He later worked as an actor, and in TV in New Zealand, using both his full name and the name Michael James.

Jim Delligatti: Michael James Delligatti (August 2, 1918 – November 28, 2016) was an American entrepreneur.  Delligatti was an early franchisee of the fast food restaurant chain McDonald's, opening the first of his eventual 48 branches in Uniontown, Pennsylvania, in 1957.  Delligatti is also credited as the creator of McDonald's "Big Mac" hamburger in 1967.

Supporting paragraphs: Jim Delligatti Big Mac
Answer: 1968