Question: In what year was the South Park season that contains the animated sitcom's 223rd episode aired?

Context articles: Hit and Run (NCIS)
Insecurity (South Park)
The Poor Kid
Chickenpox (South Park)
Towelie
3 Acts of God
Hooked on Monkey Fonics
Got to Be Real (Grey's Anatomy)
223rd Coastal Division (Italy)
South Park (season 15)

"Hit and Run" is the thirteenth episode of the tenth season of the American police procedural drama "NCIS", and the 223rd episode overall.
 It originally aired on CBS in the United States on January 29, 2013.
 The episode is written by Gary Glasberg and Gina Lucita Monreal and directed by Dennis Smith, and was seen by 22.07 million viewers.
"Insecurity" is the tenth episode of the sixteenth season of the American animated sitcom "South Park", and the 233rd episode of the series overall.
 It aired on Comedy Central in the United States on October 10, 2012.
"The Poor Kid" is the fifteenth season finale of the American animated television series "South Park", and the 223rd episode of the series overall.
 It first aired on Comedy Central in the United States on November 16, 2011.
 In the episode, Kenny and his brother and sister are sent to a foster home after police discover a meth lab in their house.
 As a result, Cartman is left with feelings of loss, since he no longer has someone to ridicule for their poverty.
"Chickenpox" is the tenth episode in the second season of the American animated television series "South Park".
 The 23rd episode of the series overall, it originally aired on Comedy Central in the United States on August 26, 1998.
 The episode was written by series co-creators Trey Parker and Matt Stone, along with Trisha Nixon, and directed by Parker.
 In the episode, the parents of South Park intentionally expose their children to the chickenpox disease.
"Towelie" is the eighth episode of the fifth season of the American animated sitcom "South Park", and the 73rd episode of the series overall.
 It originally aired on Comedy Central in the United States on August 8, 2001.
 In the episode, the boys attempt to recover their stolen video game console from the middle of a feud between a paramilitary group and extraterrestrials.
"3 Acts of God" is the thirteenth episode of the twelfth season of the animated comedy series "Family Guy" and the 223rd episode overall.
 It aired on Fox in the United States on March 16, 2014, and is written by Alec Sulkin and directed by Bob Bowen.
 In the episode, Peter is sick of opposing football teams thanking God for beating the Patriots, so he and the guys go on a quest to find the Lord and ask Him to stop determining the outcomes of football games.
"Hooked on Monkey Fonics" is episode 12 of season 3 and the 43rd overall episode of Comedy Central's animated series "South Park".
 It originally aired on November 10, 1999.
 It features issues of homeschooling and phonics, a method of teaching children to read.
 This is the final episode of South Park to feature the voice talents of Mary Kay Bergman, who committed suicide the day after the episode aired.
 The final episode to use her dialogue was "Starvin' Marvin in Space" which ended production shortly before her death.
"Got to Be Real" is the third episode of the eleventh season of the American television medical drama "Grey's Anatomy", and is the 223rd episode overall.
 It aired on October 2, 2014 on ABC in the United States.
 The episode was written by Zoanne Clack and directed by Rob Corn.
 On its initial airing it was watched by 8.48 million viewers and was well received amongst critics.
The 223rd Coastal Division was an infantry division of the Italian Army during World War II.
 The division was located in the south of France coastal region.
 The 223 Coastal Division was formed from elements of Regular Infantry Regiments from the Alpini Divisions, from the 5th and 8th Alpine Regiments and the 26th Alpine Battalion.
 Normally Coastal divisions were second line divisions, formed from men in their forties and fifties intended to perform labouring and second line duties.
 Recruited locally, they were often commanded by officers called out of retirement.
 Their equipment was also second rate.
 The Prime Minister of Italy, Benito Mussolini had hoped to obtain large quantities of arms and equipment from the disbanded Vichy French army, but this was often sabotaged or arrived with no ammunition.
The fifteenth season of the American animated sitcom "South Park" began airing on Comedy Central on April 27, 2011 and ended on November 16, 2011.
 In response to reactions to the mid-season finale episode "You're Getting Old", which seemed to insinuate that creators Trey Parker and Matt Stone were wrapping up the series, Comedy Central proclaimed through the media that "South Park" was renewed for two more seasons, and the duo were signed through 2013.
 Shortly before the airing of the season finale episode "The Poor Kid", "South Park" was extended again until 2016, taking the show to 20 seasons.
 Parker was the director and writer for all episodes, and Robert Lopez was the writer in this eleventh episode for the fifteenth season.