Question: According to the INF, how many netball players are there in the world?
About the article "Netball", section "Abstract".

Candidate passages:
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. 
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 INF World Rankings are published by the International Netball Federation (INF) to make it possible to compare the relative strengths of internationally active national netball teams.
Initially, rankings were based on the results from the World Netball Championships, and released after the conclusion of each event, every four years.
A new ranking system was implemented on 11 February 2008, wherein teams are ranked based on international tests played, currently since July 2009.
Teams appear on the rankings list once they have played eight international test matches, starting from July 2009.
The rankings are updated by the INF every month.
Australia and New Zealand have dominated the INF world rankings in previous years and they are the only two netball nations to have ever held the number one world ranking since its introduction in 2009.
Both teams are currently tied for the world number one ranking.