Question: In what year did Disney drop individual ride tickets and switch to a single admission price?
About the article "Disneyland", section "Tickets".

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From Disneyland's opening day until 1982, the price of the attractions was in addition to the price of park admission.
Guests paid a small admission fee to get into the park, but admission to most of the rides and attractions required guests to purchase tickets, either individually or in a book, that consisted of several coupons, initially labeled "A" through "C".
"A" coupons allowed admission to the smaller rides and attractions such as the vehicles on Main Street, whereas "C" coupons were used for the most common attractions like the Peter Pan ride, or the Tea Cups.
As more thrilling rides were introduced, such as the Monorail or the Matterhorn bobsled, "D" and then eventually "E" coupons were introduced.
Coupons could be combined to equal the equivalent of another ticket (e.g.
two "A" tickets equal one "B" ticket).
From the thrill ride experience at Disneyland, the colloquial expression "an E ticket ride" is used to describe any exceptionally thrilling experience.
Disneyland later featured a "Keys to the Kingdom" booklet of tickets, which consisted of 10 unvalued coupons sold for a single flat rate.
These coupons could be used for any attraction regardless of its regular value.
In 1982, Disney dropped the idea for individual ride tickets to a single admission price with unlimited access to all attractions, "except shooting galleries".
While this idea was not original to Disney, its business advantages were obvious: in addition to guaranteeing that everyone paid a large sum even if they stayed for only a few hours and rode only a few rides, the park no longer had to print tickets or ticket books, staff ticket booths, or provide staff to collect tickets or monitor attractions for people sneaking on without tickets.
Later, Disney introduced other entry options such as multi-day passes, Annual Passes (which allow unlimited entry to the Park for an annual fee), and Southern California residents' discounts.
One can gain admission to the fair by purchasing admission or visiting on a free admission day.
Ride admission may be gained by either purchasing a wristband or tickets, depending on what is up for purchase.
Wristbands can be bought for various prices on certain days.
These wristbands allow anyone wearing them to become a passenger on any ride or rides unlimited times while the fair remains open that day.
On days in which wristbands are on sale, admission must be purchased.
On other days, however, admission is free, but one must purchase tickets to become a passenger on any rides.
Tickets may be purchased by certain numbers and certain rides costs a person wishing to become a passenger a certain number of tickets. 
Disney initially refused to release the attendance figures after media reports surfaced saying the park's attendance numbers might be lower than expected.
Disney finally declared on 24 November 2005, that Disney had over 1 million guests during its first two months of operation.
In response to negative publicity locally and to boost visitor numbers, Hong Kong Disneyland offered $50 discounts for admission tickets to holders of Hong Kong I.D.
cards in the period before 2005 Christmas.
Also, from March to June 2006, the park offered Hong Kong I.D.
card holders the opportunity to purchase a two-day admission ticket for the price of a single day ticket. 
In 1980, Dorney Park Road, a former two-lane state highway (US 222) which cut through the park, was closed to traffic and converted to a midway, and U.S. 222 was rerouted.
Prior to that time, Dorney Park's narrow-gauge railroad crossed the road, which led to traffic stoppages every time the train was to cross Dorney Park Road.
This railroad crossing also helped patrons cross Dorney Park Road.
The road closing led to the enclosure of the park by fence and the introduction of a single-price admission fee, which eliminated individual ride tickets.
The park previously maintained groves for family picnics.
While the groves remained outside the park a while longer, patrons were no longer allowed to bring food inside.
The park opened its log flume ride, Thunder Creek Mountain, in 1982, which still owns the record for longest drop on a log flume ride.
In the fall of the next year, a major fire destroyed a large section of the park, including the Carousel, Bucket O' Blood, Flying Bobs, Skeeball and several food stands.
The park replaced the rides in 1984, its 100th anniversary, with the addition of Enterprise, Musik Express, Ranger, and Apollo 2000.
New skeeball alleys, gift shops, and food stands were added as well.
With the addition of the rides as well as the improvements to the park, the park's value was high enough to sell.
It was sold mid-season to Harris Weinstein in 1985.
He also bought the neighboring automobile racetrack which had been used once a year for NASCAR racing.
At that point, the racetrack was razed.
It was determined that there was a need for swimming to be brought back to Dorney Park.
With the pool being razed 20 years before, the void was filled by a waterpark called Wildwater Kingdom in 1985.
It had separate admission and included a wave pool, family water raft ride, several body slides, several tube slides, and a children's water play area.
That year, season passes began to be offered.
That year it was also determined that the park needed a looping roller coaster, so in 1986, Laser, a Schwarzkopf-designed coaster with two loops was built, giving the park three adult coasters.
This roller coaster was originally meant to be a ride that would be for fairs and carnivals, but Dorney Park kept it assembled.
The coaster was named in a commercial tie-in with a local radio station, WAEB-FM, a then-Hot AC radio station known as Laser 104.1.
Two years later, a kiddie coaster was added across from Laser called Little Laser.
This kiddie coaster originally operated as a junior coaster (children and adults were at that time able to ride) from the early 1960s to 1981 near the coaster now called Thunderhawk.
It was in storage from 1982 to 1988, and in 1989, it was moved next to and painted the same colors as the Laser and was renamed.
As a kiddie coaster, adults cannot ride the Little Laser unless accompanied by a child.
Laser was taken down in 2008 and Little Laser was renamed to Steel First.
The park further grew with debut of Hercules, a wooden terrain coaster in 1989.
It was built on the top of the hill lining what was then the back of the park, near what was at that time Wildwater Kingdom's parking lot.
This coaster was the tallest wooden roller coaster in the world until Cedar Point's Mean Streak debuted in 1991, which boasted a first drop only taller than Hercules.
Hercules proved a big hit for Dorney in the coaster's first four seasons, but was soon known for its rough, often jarringly shaky ride, due in large part to significant modifications made to Hercules after the park was purchased by Cedar Fair in 1992.
Hercules was removed in 2003 due to high maintenance costs and low ridership.
Hydra The Revenge is now where Hercules once stood, which is why its slogan is "It's the Ride That Brought Down Hercules". 
In amusement parks using the pay-as-you-go scheme, a guest enters the park at little or no charge.
The guest must then purchase rides individually, either at the attraction's entrance or by purchasing ride tickets (or a similar exchange method, like a token).
The cost of the attraction is often based on its complexity or popularity.
For example, a guest might pay one ticket to ride a carousel but four tickets to ride a roller coaster.
The park may allow guests to purchase a pass providing unlimited admissions to all attractions within the park for a specified duration of time.
A wristband or pass is then shown at the attraction entrance to gain admission.
Disneyland opened in 1955 using the pay-as-you-go format.
Initially, guests paid the ride admission fees at the attractions.
Within a short time, the problems of handling such large amounts of coins led to the development of a ticket system that, while now out of use, is still part of the amusement-park lexicon.
In this new format, guests purchased ticket books that contained a number of tickets, labeled "A," "B" and "C." Rides and attractions using an "A-ticket" were generally simple, with "B-tickets" and "C-tickets" used for the larger, more popular rides.
Later, the "D-ticket" was added, then finally the now-famous "E-ticket", which was used on the biggest and most elaborate rides, like Space Mountain.
Smaller tickets could be traded up for use on larger rides (i.e., two or three A-tickets would equal a single B-ticket).
Disneyland, as well as the Magic Kingdom at Walt Disney World, abandoned this practice in 1982.
The advantages of pay-as-you-go include the following: guests pay for only what they choose to experience, allowed them to visit the park for a short periods of time (whereas guests who get day passes in "Pay-one-price" are generally compelled to spend hours to make the most of the cost) attraction costs can be changed easily to encourage use or capitalize on popularity best suited to parks located in areas with high pedestrian traffic and surrounded by competing points-of-interest (i.e.
shopping arcade or theatre not operated by the park) and/or natural attractions, that make it hard to charge an admission fee.
For instance, Centreville Amusement Park was one of the numerous attractions on the Toronto Islands alongside beaches and boating clubs, and its pay-as-you-go fare scheme was suited its guests who usually spent only 1–2 hours at the park.
For amusement parks inside shopping centers such as the West Edmonton Mall's Galaxyland, where amusement attractions exist alongside stores, pedestrian traffic consists of both shoppers and park guests, so it may not be practical to segregate the park premises and charge an admission fee.
The disadvantages of pay-as-you-go include the following: guests may get tired of spending money almost continuously guests may not spend as much on food or souvenirs results in high volumes of low-spending guests, and the resultant low profit margins are only sufficient for mature amusement parks that are not expanding