Question: How many people were estimated to have visited the pier during the 1920s?
About the article "Navy Pier", section "First use: commercial pier and entertainment".

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Even as Chicago Municipal Pier was being built, mass-produced automobiles and trucks were beginning to wreak havoc on the package freight and passenger steamboat industries of Lake Michigan.
The Pier proved to be much more successful as a public gathering place.
In the 1920s, the Pier expanded to have its own streetcar line, a theater, and an emergency room.
It gained wide recognition in 1922 by hosting the "Pageant of Progress."
In 1927 the Pier was officially named Navy Pier in honor of the Naval personnel that served there during WWI.
In this period, the Pier was described as a summer playground, with recreational facilities that included picnicking areas, dining pavilions, a dance hall, auditorium, and children's playground.
A radio station.
WCFL, operated from the north tower of the auditorium.
During the 1920s, it is estimated that an average of 3.2 million visitors frequented the Pier annually.
This decade is sometimes called the Pier's "Golden Age".
The advent of the Great Depression in the early 1930s, as well as the increased use of trucks and automobiles, resulted in the decline of freight and passenger ship activity; however, cultural and recreational use of the Pier continued.
In 1933, the Century of Progress Exposition (World's Fair) on the lakefront also drew many conventions and visitors to the Pier.
During the 1930s, the Pier also housed various New Deal agencies.
Birnbeck Pier is a pier situated on the Bristol Channel in Weston-super-Mare, North Somerset, England, approximately south west of Bristol.
It is the only pier in the country which links the mainland to an island, linking to Birnbeck Island, a rocky island just to the west of Worlebury Hill.
The grade II* listed pier was designed by Eugenius Birch and opened in 1867.
The gothic toll house and pierhead buildings were designed by local architect Hans Price.
The pier has been closed to the public since 1994 and is now on the Buildings at Risk Register.
During the second half of the 19th and early 20th centuries the pier was popular both with locals and tourists to the town.
As a boarding point for steamers plying their trade in the Bristol Channel, it underwent various extensions and modifications over the years.
During World War II the pier was commissioned as HMS Birnbeck by the Admiralty as part of the Directorate of Miscellaneous Weapons Development (DMWD) for research into new weapons.
The pier reopened after the war, but the number of visitors and steamer passengers declined.
The final excursion visited the pier in 1979.
Today, the pier is still home to the Weston-super-Mare Lifeboat Station.
Since its closure ownership has passed hands many times and it has been subject to a series of proposals for its redevelopment which have all proved fruitless.
The pier remains in a largely derelict state. 
In 1984, £1 million of damage was caused to the pier by drifting equipment during engineering work in Sand Bay, to the north of the pier.
The damage was quickly repaired, despite fears that Birnbeck might become like nearby Clevedon Pier, which at the time was severed by a collapsed span.
The pier was again badly damaged by storms in 1990 and was closed for safety reasons in 1994.
Daily trips during the summer months to and from Cardiff, Clevedon, and Penarth were suspended indefinitely.
Due to the decline, English Heritage has placed it on the Heritage at Risk register.
In 1999, the lifeboat station installed a walkway across the pier to allow them safe access to the island, at a cost of £20,000.
In 2006 the pier was sold to Manchester company Urban Splash.
The new owners launched a competition in August 2007, inviting people to submit ideas for the regeneration of the pier and island.
At the time, the repair work required was estimated at £4 million.
There were 95 entries for the competition from around the world, whittled down to a shortlist of six.
The winner of the design competition, Levitate Architecture and Design Studio Ltd, was announced in March 2008.
The winning design included a dozen luxury apartments and a 50-room hotel.
In August 2008, the Royal Institute of British Architects (Riba) announced a campaign to redesign the buildings on the island, and six designs were submitted.
One of the designs removed the existing buildings and piers to replace them with walking paths, and added a large curvilinear concrete building to the island.
The design called for many windows in the building to create a large panorama of the surrounding seascape.
In September 2010 Urban Splash placed the pier up for sale, citing a downfall in business caused by the recession as their reason.
In September 2011 Wahid Samady and Michael Ross were reported to have bought Birnbeck Pier for an undisclosed sum; Samady had also been awarded planning permission for a new development at the nearby Royal Pier Hotel site, just yards from the pier.
In August 2012 further reports suggests the sale had not proceeded and that Urban Splash were still the owners. 
The island has a temple dedicated Tin Hau in the village of Sha Tau, and a Tam Kung Temple.
Many early residents of Ping Chau were from Shantou (Swatow) and they kept the tradition of worshiping Tam Kung after they settled on the island.
There are many ancient buildings dating to 300 years ago that can also be found there.
On one side of the island there are steep cliffs, below which is an amazing wave-cut platform, with jagged rocks, set at a 30-degree angle, like a staircase.
Here there are many rock pools containing all manner of marine life, such as sea urchins and crabs.
On the island's coastline at the pier side, there are over 60 different species of coral, and 35 species of algae.
In fact, some say that Ping Chau has the only diveable sites in Hong Kong.
For most, the island is reachable by ferry from Ma Liu Shui ferry pier, near the Chinese University of Hong Kong.
The landing point is the Tung Ping Chau Public Pier, the only public pier on the island, located at Wong Ye Kok (王爺角).
The ferry service is operated by Tsui Wah Ferry Services Co. Ltd on Saturdays, Sundays and public holidays only.
The journey takes 1 hour 40 minutes.
During the weekends, there are many people on the island.
These include those who have come to dive, and those who have come to see the cliffs and wave-cut platforms.
Some people also use it as a weekend home.
There is a camping site as well as picnic and barbecue sites on the island, managed by the Agriculture, Fisheries and Conservation Department.
57,000 people visited Ping Chau in 2005. 
The first recorded pier in England was Ryde Pier, opened in 1814 on the Isle of Wight, as a landing stage to allow ferries to and from the mainland to berth.
It is still used for this purpose today.
However it has had a leisure function in the past, with the pier head once containing a pavilion.
There are still refreshment facilities today.
The oldest cast iron pier in the world is Gravesend Town Pier, in Kent, which opened in 1834.
However, it is not recognised by the National Piers Society as being a seaside pier.
In their heyday, there were many pleasure piers across England and Wales.
These were found in most fashionable seaside resorts during the Victorian era.
There are still a significant number of piers of architectural merit still standing, although some have been lost.
The most well known piers are perhaps the two at Brighton in East Sussex and the three at Blackpool in Lancashire.
Two piers, Brighton's now derelict West Pier and Clevedon Pier, were Grade 1 listed:Brighton West lost its status after a series of fires and storms.
The Birnbeck Pier in Weston-super-Mare is the only pier in the world that is linked to an island.
The National Piers Society gives a figure of 55 surviving seaside piers in England and Wales.