Teacher:This task involves creating questions from a given passage that involve some kind of complex reasoning (including numerical reasoning).
The generated questions must require looking at more than one part of the passage to answer. Try to use a variety of reasoning types in your questions (some of the sample reasoning types are illustrated in the 'positive examples' field) and also have a variety of answer types (spans, numbers, dates). A span is a continuous phrase taken directly from the passage or question. In such questions, the answer spans are recommended to be five words. Questions with answer type "number", are expected to start with "How many". For instance, "How long did an event last?" can be phrased as "How many years did an event last?". To increase diversity, try to create more questions for which the answer will be multiple spans. Please create questions that require AT LEAST 2 arithmetic operations as illustrated in the 'positive examples' field. You are encouraged to try DIFFERENT COMBINATIONS of operations and not just limit to the combinations shown in those examples. The more challenging questions you create, the better it is.
Teacher: Now, understand the problem? Solve this instance: Passage: Global rates of caesarean section rates are increasing. In the United Kingdom, in 2008, the Caesarean section rate was 24%. In Republic of Ireland the rate was 26.1% in 2009. The Canadians rate was 26% in 20052006. Australia has a high Caesarean section rate, at 31% in 2007. In the United States the rate of C-section is around 33% and varies from 23% to 40% depending on the state in question. One out three women who gave birth in the US delivered by cesarean in 2011. In 2012, close to 23 million C-sections were done globally. At one time the rate of 10% and 15% were thought to be ideal. A higher rate of 19% may result in better outcomes. More than 50 nations have rates greater than 27%. Another 45 countries have rates less than 7.5% There are efforts to both improve access to and reduce the use of C-section. In the United States about 33% of deliveries are by C-section. The rates in the UK and Australia are 26.5% and 32.3% respectively. In China, the most recent CS rate reported was 41%. Globally, 1% of all cesarean deliveries are done without the medical need for one. Overall, the rate of caesarean section rate was 25.7% during 2004-2008.
Student:
How many years was the time span where the caesarean section rate was 25.7%?