Question: From 2007 to 2011 what is the percentage increase of people playing rugby union or one of its variants?
About the article "Rugby union", section "Statistics and records".

Candidate passages:
According to a 2011 report by the Centre for the International Business of Sport at Coventry University, there are now over four and a half million people playing rugby union or one of its variants organised by the IRB.
This is an increase of 19 percent since the previous report in 2007.
The report also claimed that since 2007 participation has grown by 33 percent in Africa, 22 percent in South America and 18 percent in Asia and North America.
In 2014 the IRB published a breakdown of the total number of players worldwide by national unions.
It recorded a total of 6.6 million players globally, of those, 2.36 million were registered members playing for a club affiliated to their country's union.
Rugby union's premier event, the Rugby World Cup, has continued to grow since its inception in 1987.
The first tournament, in which 16 teams competed for the title, was broadcast to 17 countries with an accumulated total of 230 million television viewers.
Ticket sales during the pool stages and finals of the same tournament was less than a million.
The 2007 World Cup was contested by 94 countries with ticket sales of 3,850,000 over the pool and final stage.
The accumulated television audience for the event, then broadcast to 200 countries, was 4.2 billion.
The most capped international player from the tier 1 nations is Irish and British Lions centre Brian O'Driscoll who has played in 141 internationals.
While the top scoring tier 1 international player is New Zealand's Dan Carter, who has amassed 1442 points during his career.
In April 2010 Lithuania broke the record of consecutive international wins previously held by New Zealand and South Africa, which was 17 consecutive wins against tier 1 nations, with their 18th win in tier 2 in a match against Serbia.
The highest scoring international match between two recognised unions was Hong Kong's 164–13 victory over Singapore on 27 October 1994 While the largest winning margin of 152 points is held by two countries, Japan (a 155–3 win over Chinese Taipei) and Argentina (152–0 over Paraguay) both in 2002.
The Greece National Rugby Union team represents one of the world's newest rugby union playing nations.
The national team is governed by the HRF (Hellenic Rugby Federation), or EOP (Elliniki Omospondia Rugby), presided by Evangelos Stamos.
Greece has been participating in international competitions since October 2005 playing its first international game against Austria in Vienna.
Since then, they have played several international games in FIRA competition 3D, and in Greece.
Greece played Slovakia in the Final on 12 May 2007 in Thessaloniki, were they won 20–17 and in doing so gained promotion to division 3C.
The current coach of the Greek national team is Mike Bishop taking over from Niall Doherty who is currently involved with Turkey. 
The game of rugby union has spawned several variants of the full-contact, 15-a-side code.
The two more common differences applied to the variants of the sport lie in either fewer players or reduced player contact.
Of the variants, the oldest is Rugby sevens (7's, or VIIs), a fast-paced variant which originated in Melrose, Scotland in 1883.
In rugby sevens, there are only seven players per side, and each half is normally seven minutes.
Major tournaments include the Hong Kong Sevens and Dubai Sevens, both held in areas not normally associated with the highest levels of the 15-a-side game.
A more recent variant of the sport is Rugby tens (10's or Xs), a Malaysian variant with ten players per side.
Due to the physical nature of playing rugby, several variants have been created to introduce the sport to children with a reduced level of physical contact.
Of these versions, Touch rugby, in which "tackles" are made by simply touching the ball carrier with two hands, is popular as a mixed sex version of the sport played by both children and adults.
Tag Rugby, is a version in which the participants wear a belt with two hook-and-loop fastener tags, the removal of either counting as a 'tackle'.
Tag Rugby also varies in the fact that kicking the ball is not allowed.
Mini rugby is another variant of rugby union aimed at fostering the sport in children.
It is played with only eight players and on a smaller pitch.
Similar to Tag Rugby, American Flag Rugby, (AFR), is a mixed gender, non-contact imitation of rugby union designed for American children entering grades K-9.
Both American Flag Rugby and Mini Rugby differ to Tag Rugby in that they introduce more advanced elements of rugby union as the participants age.
Other less formal variants include beach rugby and snow rugby. 
History.2011 launch.
Lindenwood rugby began with the announcement in January 2011 the additions of men's and women's rugby to begin competition in the 2011-12 academic year.
Lindenwood rugby was launched as one of the few varsity college rugby programs in the United States, and the program also provided scholarship funding for its student athletes.
The university launched its rugby program, in part due to the growth of high school rugby throughout the country, Lindenwood's recognition of rugby's potential, and Lindenwood's realization that a strong rugby program could increase admissions.
Ron Laszewski was selected as the first head coach of the Lions rugby team.
Laszewski is a former head coach of the Saint Louis Bombers in the Rugby Super League, and was the first American coach to complete the International Rugby Board's Level 3 certification program.
Lindenwood began play in USA Rugby Division II level in the Missouri Rugby Football Union (Missouri RFU), and in its first season Lindenwood played a mixed schedule of both Division I and II college programs.
Lindenwood began with high expectations, intending from the outset to advance to higher levels of college rugby competition as the program matures.
Despite the fact that the Lions had just begun competitive play, Rugby Mag ranked the Lions 2nd in their preseason poll behind defending Division II champions, University of Wisconsin–Whitewater. 
The RC Leipzig is a German rugby union club from Leipzig, currently playing in the Rugby-Bundesliga, the top tier of German rugby.
The club, formed in 2004, traces its history back to the early 1950s, when a number of successful rugby clubs were formed in Leipzig in what was then East Germany.
Between them, these predecessor clubs have won nine East German rugby union championship.