The guoyu-speaking ratio in Taiwan is probably greater than the rest of China.
news.yahoo.com/s/ap/20070307/ap_ … RwN1pPzWQA
[quote]
Half of Chinese speak national language
Wed Mar 7, 8:04 AM ET
BEIJING - More than half of all Chinese surveyed by the Ministry of Education said they can speak to each other in the country’s national language, the state-run Xinhua News Agency reported Wednesday.
Of the half-million people asked, 53 percent said they can communicate effectively in spoken Mandarin, Xinhua reported. In cities, the rate was 66 percent, while in rural areas, it was 45 percent.
All Chinese dialects share the same written language, which has been in use for 3,000 years, but the pronunciation of the identical characters differs from area to area, especially between northern and southern China.
Mandarin is called “putonghua,” or common language, in China and the constitution says the government will promote its use throughout the country, but that minorities have the right to use and develop their own languages.
More younger people understand Mandarin, with about 70 percent of those between the ages of 15 and 29 speaking it, while 31 percent of those between the ages of 60 and 69 said they can speak Mandarin.
The survey was conducted in 31 provinces, autonomous regions and municipalities in China, Xinhua said.[/quote]