Question: When was box lacrosse introduced?
About the article "Lacrosse", section "Box lacrosse".

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Up until the 1930s, all lacrosse was played on large fields outdoors.
The owners of Canadian hockey arenas invented a reduced-size version of the game, called box lacrosse, as a means to make more profit from their arena investments, and because severe winter weather in many areas limits outdoor play.
Since 1985, when the Canadian University Field Lacrosse Association (CUFLA) began operating a collegiate men's league, field lacrosse has witnessed a revival in Canada.
There are now 12 varsity teams.
In 1994, Canada declared lacrosse its national summer sport in the .
In 1987, a men's professional box lacrosse league was started, called the Eagle Pro Box Lacrosse League.
This league changed its name to the Major Indoor Lacrosse League, then later to the Lacrosse League.
It grew to encompass men's lacrosse clubs in 14 cities throughout the United States and Canada. 
Lacrosse has a minor presence, tending to be played by girls at private schools, although there have been some male university teams as well.
Field lacrosse is the main sport, but box lacrosse is also played.
It is always at amateur level.
However, lacrosse in Scotland goes back to 1890 at St Leonards School, Fife, where women's lacrosse had been introduced by Louisa Lumsden.
Lumsden brought the game to Scotland after watching a men's lacrosse game between the Canghuwaya Indians and the Montreal Lacrosse Club.
One of Lumsden's students, Rosabelle Sinclair, established the first women's lacrosse team in the United States was at the Bryn Mawr School in Baltimore, Maryland.
Scotland fields three national teams - men's, women's and an indoor side 
Other sports.
Lacrosse was invented in the 1850s, when the Anglophone middle class of Montreal adopted the Indian game of "baggataway", which was a violent game played by the First Nation teams numbering hundreds of players.
The 1860s saw the first powerhouse team, the Montreal Shamrocks; it was Irish, Catholic, and aggressive.
During the 1870s and 1880s the Shamrocks had bloody confrontations with the upscale Protestant Montreal and Toronto Lacrosse Clubs.
Field lacrosse spread across the country with the tide of Anglophone settlers from Ontario and Quebec.
By the early 1890s it was the most popular summer game in Canada.
The golden age came in the 1900s, as two professional leagues operated.
Escalating violence led to the collapse of the professional leagues in 1914, and the game's base of support shrank to Montreal, Victoria, Vancouver, New Westminster, and small-towns in Ontario.
The organizational infrastructure proved too weak—for example, it was never adopted by schools or churches.
In 1931, promoters introduced "box lacrosse" to broaden the fan base to include a summer audience.
Played in a smaller space, box lacrosse could be held indoors or in baseball stadiums.
The game was especially violent.
The poverty of the Great Depression reduced the number of fans who could afford to attend and cities that could find sponsors.
The promoters, while failing to make a profit, changed the landscape of Canadian amateur lacrosse, isolating it from the more widely contested field lacrosse played in the United States, Britain, and Australia.
In 1987 the National Lacrosse League began; it opened clubs in twelve cities in the United States and Canada.
Field lacrosse was revived in the late 1990s when some Ontario universities included it in their women's athletic programs; university women now play the game once associated with Canadian masculinity. 
The first westerners to encounter lacrosse were French Jesuit missionaries in the St. Lawrence Valley.
During the 1630s, they witnessed the game and condemned it.
They were opposed to lacrosse because it was violent, betting was involved, and it was part of the religion they sought to eradicate.
One missionary, Jean de Brébeuf, was the first to write about lacrosse and thus gave it its name.
He described the Huron Indians playing in 1636.
Some say the name originated from the French term for field hockey, "le jeu de la crosse".
Others suggest that it was named after the "crosier", a staff carried by bishops.
Despite Jesuit opposition, many other European colonists were intrigued by lacrosse.
Betting on games became common, and around 1740 many French colonists were taking up the game.
However, it is widely believed they could not match the skill of the Native Americans.
In 1763, Ojibwas used a lacrosse game to gain capture Fort Michilimackinac (now Mackinac).
Natives invited the fort's British troops to watch a lacrosse game.
The players gradually worked their way close to the gates, and then rushed into the fort and carried out a general massacre.
In 1805 during an expedition up the Mississippi River, U.S. army officer Lt. Zebulon Pike observed a group of young Sioux and Winnebago men playing this game, or one resembling it, near the east bank of the river, in what is now west-central Wisconsin.
He named the region "Prairie La Crosse", which in turn inspired the name of both the Wisconsin county and its principal city in that region.
Today, two statues in the city of La Crosse (one downtown, the other along southbound US Highway 53 entering the city from the north) commemorate the game observed by Pike.
In 1834 a team of Caughnawaga Indians demonstrated lacrosse in Montreal.
Although response to the demonstrations was not overwhelming, interest in lacrosse steadily grew in Canada.
In 1856, William George Beers, a Canadian dentist, founded Montreal Lacrosse Club.
He codified the game in 1867 to shorten the length of each game, reduce the number of players, use a redesigned stick, and use a rubber ball.
The first game played under Beers' rules was at Upper Canada College in 1867.
During the 1860s lacrosse became Canada's national game.
The first overseas exhibition games were played in 1867.
In 1876, Queen Victoria witnessed an exhibition game and was impressed, saying "The game is very pretty to watch."
Her endorsement was enough for many English girls' schools to adopt the sport in the 1890s.
The Mohawk Lacrosse Club in Troy, New York became the first organized club in the United States.
As lacrosse grew, opposition to its violent aspects was a major obstacle.
The game was banned in some areas when, in 1900, Choctaw Indians attached lead weights to their sticks to use them as skull-crackers.
By the 20th century, many high schools, colleges and universities had adopted lacrosse as a league sport.
Lacrosse became an Olympic sport for the 1904 and 1908 Summer Olympics, but was then dropped as an official sport.
After 1908, lacrosse was a sport in the World Games.
In the 1930s, an indoor version of the game, box lacrosse, was introduced in Canada.
It quickly became the dominant form of the sport in Canada, in part due to the severe winter weather that limited outdoor play.
Minor leagues developed for box lacrosse and college lacrosse.
Two professional leagues also were created: In 1987 the Eagle Pro Box Lacrosse League was founded; it eventually became the Major Indoor Lacrosse League, and then the National Lacrosse League (NLL).
In the summer of 2001, a professional field lacrosse league, known as Major League Lacrosse (MLL), was inaugurated. 
Woolley’s introduction to box lacrosse came by chance when he was invited to play by a group of boys.
After he picked up a lacrosse stick and played the game, he fell in love with the sport immediately.
He played high school lacrosse at Burnaby North Secondary school.
Woolley also played amateur lacrosse for Renfrew Minor, Burnaby Minor, Burnaby Junior and the Chilliwack Junior A league.