Question: Renovation of the Navy Pier started at what time?
About the article "Navy Pier", section "Plans".

Candidate passages:
In 1997, a renovation process started.
At this time, the museum was in economic distress and the number of annual visitors was low. 
From 1965–1989, Navy Pier was considered underutilized.
In the bicentennial year of 1976, opened by a concert by Fort Sheridan's 81st Army Band, Navy Pier began its fourth life as an area for public exhibits, when the East Buildings (furthest into Lake Michigan) were opened as exhibition halls.
Special events including music and arts festivals (ChicagoFest was one) began to draw crowds to the Pier despite its aging infrastructure.
The halls were used to represent Atlantic City, New Jersey, in the 1986 movie The Color of Money for the 9-Ball Championship.
From 1979 to 1987, a submarine, the USS "Silversides", was docked at Navy Pier.
In 1989, the Metropolitan Pier and Exposition Authority took control over the Pier.
Major renovation and construction followed in the 1990s at a cost of US$200 million.
As rebuilt in the 1990s, the Pier's layout included fast-food kiosks, shops, a ballroom, a concert stage, and convention exhibition halls.
Centerpiece attractions include a Ferris wheel, an IMAX theater, the Chicago Shakespeare Theater, Amazing Chicago's Funhouse Maze, the Chicago Children's Museum, the Smith Museum of Stained Glass Windows, and at the entrance to Navy Pier is a statue of Oak Park comedian Bob Newhart, sponsored by the TV Land network.
The Pier now features a large front lawn showcasing numerous larger-than-life public art sculptures and an interactive animated fountain created by WET (of Fountains of Bellagio fame).
The Pier continues to be used as an embarkation point for tour and excursion boats and is a popular place to watch lakefront events, including the annual Air and Water airshow and the parade of lighted and decorated boats during Chicago's Venetian Night festival.
The Pier and its grounds encompass more than of parks, gardens, shops, restaurants and other shore entertainment.
Navy Pier contains 170,000 total square feet of exhibition space, of reception space and of meeting room space. 
Pier 55 is located at the foot of Seneca Street.
Pier 55 is the next pier to the south.
Pier 56 is the next pier to the north. 
Navy Pier is a long pier on the Chicago shoreline of Lake Michigan.
It is located in the Streeterville neighborhood of the Near North Side community area.
The pier was built in 1916 at a cost of $4.5 million.
It was a part of the Plan of Chicago developed by architect and city planner Daniel Burnham and his associates.
As Municipal Pier #2 (Municipal Pier #1 was never built), Navy Pier was planned and built to serve as a mixed-purpose piece of public infrastructure.
Its primary purpose was as a cargo facility for lake freighters, and warehouses were built up and down the Pier.
However, the Pier was also designed to provide docking space for passenger excursion steamers, and in the pre–air conditioning era parts of the Pier, especially its outermost tip, were designed to serve as cool places for public gathering and entertainment.
The Pier even had its own tram.
Today, Navy Pier is Chicago's number one tourist attraction. 
 Mainside: The in Colts Neck house most of Earle's departments and facilities.
The Navy Munitions Command, Detachment Earle, performs the station's primary mission: storing and providing ammunition to the fleet.
Military and civilian personnel operate the inland storage, renovation, transshipment and demilitarization facilities.
Waterfront: At the Waterfront Complex, the Navy Munitions Command provides ammunition for nearly every class of ship operated by the navy and United States Coast Guard as well as commercial vessels from other countries.
Pier Complex: The station's pier complex is one of the longest "finger piers" in the world.
A two-mile (3 km) trestle connects to three finger piers.
One mile from the shore the trestle branches off to Pier 1.
At the junction of Piers 2, 3 and 4, a concrete platform supports a forklift/battery-recharging shop and the port operations building.
This area is known as the "wye."
Earle is also near the Henry Hudson bike trail.