Question: How many people play netball according to the INF?
About the article "Netball", section "Abstract".

Candidate passages:
Netball is a ball sport played by two teams of seven players.
Its development, derived from early versions of basketball, began in England in the 1890s.
By 1960, international playing rules had been standardised for the game, and the International Federation of Netball and Women's Basketball (later renamed the International Netball Federation (INF)) was formed.
As of 2011, the INF comprises more than 60 national teams organized into five global regions.
Games are played on a rectangular court with raised goal rings at each end.
Each team attempts to score goals by passing a ball down the court and shooting it through its goal ring.
Players are assigned specific positions, which define their roles within the team and restrict their movement to certain areas of the court.
During general play, a player with the ball can hold onto it for only three seconds before shooting for a goal or passing to another player.
The winning team is the one that scores the most goals.
Netball games are 60 minutes long.
Variations have been developed to increase the game's pace and appeal to a wider audience.
Netball is most popular in Commonwealth nations, specifically in schools, and is predominantly played by women.
According to the INF, netball is played by more than 20 million people in more than 80 countries.
Major transnational competitions take place, including the Netball Superleague in Great Britain and the ANZ Championship in Australia and New Zealand.
Three major competitions take place internationally: the quadrennial World Netball Championships, the Commonwealth Games, and the yearly World Netball Series.
In 1995, netball became an International Olympic Committee recognised sport.
The IFNA reports that over 20 million people currently play netball in more than 80 countries, with 74 national netball associations affiliated with the worldwide governing body.
It is the most popular team sport for women in Australia and New Zealand, and remains a popular women's sport throughout the Commonwealth of Nations, including in the United Kingdom, South Africa and Jamaica.
Television coverage has increased the profile of the sport in countries with elite domestic competitions, but in many cases not to the extent of well-established male-dominated sports.
Netball has also yet to reach the status of a fully professional sport in any country.
Further developments to the sport are being trialled.
A new shortened version of the sport was announced by the INF in December 2008, which was called "fastnet" (now "Fast5").
Featuring six-minute playing quarters, long-distance shots worth multiple points, and "power plays" in which goals count for double points, the new version of the sport has been likened to cricket's Twenty20.
The format is primarily used in the World Netball Series, which was first contested in October 2009 and is held annually.
This new competition has been contested between the top six netballing nations, according to the INF World Rankings.
Major international competitions in the immediate future include the 2013 World Youth Netball Championships and the 2014 Commonwealth Games, both held in Glasgow.
Fast5 tournaments have emerged in several countries following the introduction of the World Netball Series in 2009.
Efforts were also started in England in 2008 advocating netball's inclusion in the Summer Olympic Games programme, either as a demonstration sport or as a fully competitive sport in future Games. 
The INF is responsible for organising the World Netball Championships, the premier event in international netball, held every four years.
The table below contains a list of these championships, where they took place and how many teams competed in the event. 
The tournament was contested by the six top national netball teams in the world, according to the INF World Rankings: New Zealand, Australia, England, Jamaica, Malawi and South Africa. 
Netball Switzerland was founded in 2008 by a group of volunteers to sponsor and promote the game of Netball within Switzerland.
Netball Switzerland is a full member of INF (International Netball Federation) and Netball Europe.
Switzerland has World Ranking in Netball.