Question: In how many years has Switzerland become largely urban rather than largely rural>
About the article "Switzerland", section "Urbanization".

Candidate passages:
Between two thirds and three quarters of the population live in urban areas.
Switzerland has gone from a largely rural country to an urban one in just 70 years.
Since 1935 urban development has claimed as much of the Swiss landscape as it did during the previous 2,000 years.
This urban sprawl does not only affect the plateau but also the Jura and the Alpine foothills and there are growing concerns about land use.
However from the beginning of the 21st century, the population growth in urban areas is higher than in the countryside.
Switzerland has a dense network of cities, where large, medium and small cities are complementary.
The plateau is very densely populated with about 450 people per km2 and the landscape continually shows signs of man's presence.
The weight of the largest metropolitan areas, which are Zürich, Geneva–Lausanne, Basel and Bern tend to increase.
In international comparison the importance of these urban areas is stronger than their number of inhabitants suggests.
In addition the two main centers of Zürich and Geneva are recognized for their particularly great quality of life.
The former mayors of Meaford were:  1998-2000: Doug Grant  2001-2003: Gerald Shortt (first Mayor since 2001 amalgamation)  2003-2008: Wally Reif  2008–Present: Francis Richardson Meaford is on the eastern edge of the Bruce—Grey—Owen Sound federal and provincial electoral district.
Since the time of amalgamation in 2001, a large and vocal group of citizens has continued to object to the forced amalgamation, and this continued objection plays a role in shaping local politics, juxtaposing urban Meaford against rural Meaford.
Many rural residents see the list of amenities within the Town of Meaford as perks for which rural tax dollars are spent, rather than spending for roads and other necessary services in the rural areas.
The debate is interminable, and continues largely due to the imbalance of power on municipal council held by the Town of Meaford.
Property taxes within the Municipality of Meaford continue to be exceedingly high in relation to other rural areas nearby. 
One group of special concern are work migrants, most often poor men, who leave the countryside to join the wage economy in towns and cities all over China.
Some come from areas such as Henan Province where huge numbers of peasants were infected with HIV from scandalous plasma-donor practices in the 1990s.
Many male migrants are at risk of unprotected sex when away from home.
And men are also at higher risk of tuberculosis than women in China because the male-to-female ration of adults with pulmonary tuberculosis is about 2:1 or more, reflecting a real risk excess rather than differential detection or notification.
So several factors converge in young male migrant workers to put them at risk of both HIV and tuberculosis, and this convergence has been of great concern.
With this "floating" migrant population making up 10% of the total being poorer and having more tuberculosis than average, China has far more than its share of tuberculosis (disease burden) in the world.
This problem is compounded because China's internal work migrants often live and work in circumstances that promote transmission of tuberculosis and impede its diagnosis and treatment.
They are usually so poor that the cost of adequate diagnosis and treatment is prohibitively expensive.
Indeed, they may not be able to get treated at all unless they return to their home village in the poor interior, because subsidized management of tuberculosis (and other social welfare) is only available through facilities in the area where they were registered at birth.
Those born in rural zones are not allowed to switch registration to become urban residents.
They have been allowed to leave their area (temporarily) or work since 1992 and now number more than 100 million.
China's rapid economic growth depends on them, but if they get tuberculosis, they have to return home for treatment.
Going home for rural healthcare in China is not ideal either.
Over the past 30 years, that part of the health system has run down because government funding has fallen while everything else has become more expensive.
Health facilities attempted to make up shortfalls by charging ever larger fees for diagnosis and treatment, especially for a difficult disease like tuberculosis.
In China today, patients' payments keep the health services running and the medical staff have been encouraged to supply profitable health goods and services, especially drugs.
Their own jobs depend on adequate operational funds, which are largely generated through user fees.
Meanwhile, over the same 30 years, the socialist system of universal rural health-insurance collapsed and was not replaced apart from some pilot tests of an under-resourced community-based scheme in the 1990s.
Until recently, virtually all rural residents, 900 million in all, had no health insurance at all.
This situation will change if the current experiments with community-based health-insurance succeed and are then adopted nationally, but in the meantime as many as 10% of rural households have catastrophic medical payments (exceeding 40% of their disposable income) every year. 
South Dakota is relatively notable for its lack of large urban centers.
Sioux Falls, the largest city in the state, only ranks as the 152nd largest in the country, and the state's third-largest city, Aberdeen, has a population of less than 25,000.
However, because the population in many rural areas has decreased over the last 50 years, and many cities in the state have grown at a rapid pace; the population has become more concentrated and less rural than it once was.
According to 2007 census estimates, the three most populous counties in the state, Minnehaha, Pennington, and Lincoln, were home to 38.8% of South Dakotans, while in 1910, those counties held only 9.3% of the population.
Sioux Falls is the largest city in South Dakota, with an estimated 2007 population of 151,505, and a metropolitan area population of 227,171.
The city is located in the southeast corner of the state, and was founded in 1856.
The economy of Sioux Falls, originally focused on agri-business and quarrying, has recently become largely centered on retail and financial services.
Rapid City, with a 2007 estimated population of 63,997, and a metropolitan area population of 120,279, is the second-largest city in the state.
It is located on the eastern edge of the Black Hills in western South Dakota, and was founded in 1876.
Rapid City's economy is largely based on tourism and defense spending, due to the close proximity of tourist attractions in the Black Hills and Ellsworth Air Force Base.
The next eight largest cities in the state, in order of descending 2007 population, are Aberdeen (24,410), Watertown (20,530), Brookings (19,463), Mitchell (14,832), Pierre (14,032), Yankton (13,643), Huron (10,902), and Vermillion (10,251).
Pierre is the state capital, and Brookings and Vermillion are the locations of the state's two largest universities.
Of the ten largest cities in the state, Rapid City is the only one located west of the Missouri River. 
Urban-Biased Policies.
In China, rural-urban income differentials “constitute a large share of total inequality, and the widening sectoral gaps in recent years have caused the rising inequality in China.” Research conducted by Dennis Tao Yang published in the journal of the American Economic Association indicates that the root of China’s rural-urban divide “lies in the strategy of the centrally planned system that favored heavy-industry development and extracted agricultural surplus largely for urban capital accumulation and urban-based subsidies.” In the 1980s and 1990s, state investments in the rural economy accounted for “less than 10 percent of the budget, despite the fact that the rural population was about 73-76 percent of the national population.”