Question: When did Disney end individual ride tickets and adopt the single admission price?
About the article "Disneyland", section "Tickets".

Candidate passages:
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.
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. 
The park offers free admission, free parking, and free entertainment.
Visitors are able to ride the park's attractions by purchasing either pay-one-price, all-day/unlimited-access wristbands (which are not usually available on weekends, except near the beginning and end of each season), limited-access hand stamps or books of tickets, with hand stamp costs varying depending on the height of the rider.
Knoebels has several hand stamp options, such as "Sundown Plan" and "Bargain Nights", when the park offers discounts on regular ride passes.
Knoebels all-day passes do not include: the Haunted Mansion, the Black Diamond dark ride, and the Crystal Pool which are additional fees.
The "Scenic Skyway" as well as Flying Turns were also an additional fee when opened, but they have since been included in most pay-one-price plans. 
Ticket resale (also known as ticket scalping or ticket touting) is the act of reselling tickets for admission to events.
Tickets are bought from licensed sellers and are then sold for a price determined by the individual or company in possession of the tickets.
Tickets sold through secondary sources may be sold for less or more than their face value depending on demand, which itself tends to vary as the event date approaches.
When the supply of tickets for a given event available through authorized ticket sellers is depleted, the event is considered "sold out", generally increasing the market value for any tickets on offer through secondary sellers.
Ticket resale is more common in sporting events and music events.
Ticket resale is a form of arbitrage that arises when the amount demanded at the sale price exceeds the amount supplied (that is, when event organizers charge less than the equilibrium prices for the tickets). 
Every vehicle has a fare collector who sells single-ride tickets valid for this particular ride only.
Alternatively, once can purchase a monthly ticket, valid for a calendar month.
A single-ride ticket costs 2 MDL, and the price of the monthly pass is 180 MDL.