Question: What is the year of the event that occured first, The Trials of Life was transmitted, or The Five Obstructions was produced?

Context paragraphs:
CMLL 74th Anniversary Show: The CMLL 74th Anniversary Show was a professional wrestling major show event produced by Consejo Mundial de Lucha Libre (CMLL) that took place on September 28, 2007 in Arena México, Mexico City, Mexico.  The show consisted of six matches, with the main event being an "Infierno en el Ring" (Spanish for "Hell in the ring") Steel cage match, contested under "Lucha de Apuestas" rules, which mean the last man in the cage would be forced to unmask.  The participants risking their mask were: Atlantis, Blue Panther, Lizmark Jr., Místico, Perro Aguayo Jr., Dr. Wagner Jr., Último Guerrero and Villano V.  The event also featured five Six-man tag team matches, including an all-female match.  The event commemorated the 74th anniversary of CMLL, the oldest professional wrestling promotion.  in the world.  The anniversary show is CMLL's biggest show of the year, their Super Bowl event.  The 74th anniversary show was transmitted live on Pay-Per-View, something only a few anniversary shows before this one had been.

The Trials of Life: The Trials of Life: A Natural History of Behaviour is a BBC nature documentary series written and presented by David Attenborough, first transmitted in the United Kingdom from 3 October 1990.

William Fox-Pitt: William Fox-Pitt (born 2 January 1969) is an English equestrian who competes in eventing.  His career highlights include winning three Olympic medals in the team event, with silver in 2004 and 2012, and bronze in 2008.  At the World Equestrian Games, he won team gold and individual silver in 2010, and team silver and individual bronze in 2014.  He also won World team medals in 2002 and 2006.  At the European Championships, he has won six team gold medals, as well as Individual silver in 1997 and 2005, and Individual bronze in 2013.  In 2011, he became the first rider to win five different four-star events, having won the Burghley Horse Trials a record six times (1994, 2002, 2005, 2007, 2008 and 2011), Rolex Kentucky three times (2010, 2012, 2014), Stars of Pau twice (2011, 2013), the Badminton Horse Trials twice (2004, 2015), and the Luhmühlen Horse Trials once (2008).  A serious fall in 2015 left him in a coma for two weeks, but he came back to make the British eventing team and attend the 2016 Summer Olympics.

CMLL 73rd Anniversary Show: The CMLL 73rd Anniversary Show was a professional wrestling major show event produced by Consejo Mundial de Lucha Libre (CMLL) that took place on September 29, 2006 in Arena México, Mexico City, Mexico.  The show consisted of six matches, with the main event being a "Lucha de Apuestas", mask vs. mask match between Místico and Black Warrior.  It also featured five Six-man tag team matches, including the final match in a tournament for the vacant CMLL World Trios Championship.  The event commemorated the 73rd anniversary of CMLL, the oldest professional wrestling promotion.  in the world.  The anniversary show is CMLL's biggest show of the year, their Super Bowl event.  The 73rd anniversary show was transmitted live on Pay-Per-View, something only a few anniversary shows before this one had been.

The Five Obstructions: The Five Obstructions is a 2003 Danish documentary film directed by Lars von Trier and Jørgen Leth.  The film is conceived as a documentary, but incorporates lengthy sections of experimental films produced by the filmmakers.  The premise is that von Trier has created a challenge for his friend and mentor, Jørgen Leth, another renowned filmmaker.  von Trier's favorite film is Leth's "The Perfect Human" (1967), and von Trier gives Leth the task of remaking "The Perfect Human" five times, each time with a different "obstruction" (or obstacle) imposed by von Trier.

Dublab: dublab is a non-profit music public broadcasting internet radio station based in Los Angeles.  They have also been involved with art exhibition, film projects, event production, and record releases.  Their broadcast is transmitted via Shoutcast, open formatted and live five days per week with two hour shows hosted by a collective of approximately 30 DJs.  These Shows are archived and downloadable on the dublab website.  Twice a year they broadcast live for four weeks to raise funds which is known as their Proton Drive.

Brighton Speed Trials: The Brighton Speed Trials, in full The Brighton National Speed Trials, is commonly held to be the oldest running motor race.  The first race was held 19–22 July 1905 after Sir Harry Preston persuaded Brighton town council to tarmac the surface of the road adjacent to the beach between the Palace Pier and Black Rock to hold motor racing events.  This stretch was renamed Madeira Drive in 1909 and the event is still held there, normally on the second Saturday of September each year.  In 1936 "Motor Sport" described the event as: "undoubtedly the most important speed-trials on the British Calendar."

Spaced retrieval: Spaced retrieval, also known as expanded retrieval or uniform retrieval, is a learning technique, which requires users to rehearse information to be learned at different and increasing spaced intervals of time or a set uniform amount of time.  In testing this type of learning, people are instructed to rehearse a given set of information at a certain time, and each new rehearsal is expected to have a longer period of time between itself and the previous rehearsal or an equal amount of time between rehearsals.  At the end of every trial period there is a test phase.  Landauer and Bjork first studied this technique of learning in 1978.  The study required participants to learn names from flash cards.  Prior to learning participants were placed into five different rehearsal types: uniform short, uniform moderate, uniform long, expanding, and contracting.  These all indicate the amount and spacing of trials between each test.  Uniform trials involve a number of trials between each test stage, but the trial numbers are fixed (e.g. 2-test-2-test-2-test).  Contracting rehearsals involve larger intervals of time between the first few trials and the test phase, but eventually the trials decrease in number.  Expanding involves starting with trials and tests close together, and as they progress the person would have more time between each trial and test (e.g. 1-test-2-test-3-test).  The effectiveness of the rehearsal types was measured by seeing how accurately participants responded during a test phase.  Expanding was proven to be the most important because it produced the highest amount of recall during the test period.

List of Press Gang episodes: This is a list of television episodes from the British television show "Press Gang".  "Press Gang" was produced by Richmond Film & Television for Central, and screened on the ITV network in its regular weekday afternoon children's strand, "Children's ITV".  All 43 episodes across five series were written by Steven Moffat.  The first episode was transmitted on 16 January 1989, and the final transmitted on 21 May 1993.  The show gained an adult audience in an early evening slot when repeated on Sundays on Channel 4.

Shital Mahajan: Shital Mahajan Rane, is an Indian extreme sportsperson, skydiver and the holder of five world records and 14 National records in the sport.  She is known as the first woman to perform first parachute jump of life without training over the Geographical North pole in minus 37 degree Celsius from 2400 ft, and first accelerated free fall jump without any trials over the Antarctica - South pole from 11,600 feet, in minus 38 degree Celsius the youngest woman to jump over both the North and South Poles, and the first woman jumper to perform it without trials.  The Government of India honored Mahajan in 2011, with the fourth highest civilian award of Padma Shri.

Supporting paragraphs: The Trials of Life The Five Obstructions
Answer: 1990