You will be given a definition of a task first, then some input of the task.
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.

Passage: The population in Italy may have been introduced from the zoo Faunistic Park Le Cornelle which has kept a free-flying group since the early 1980s, or possibly from Brittany, but this is unclear. The first pair was seen breeding in the nearby heronry at Oldenico, in Lame del Sesia Regional Park in Novara, NW Italy, in 1989. By 1998 there was a colony of 9 pairs and 48 birds here; by 2000 there were 24-26 pairs, and by 2003 there were 25-30 breeding pairs. A second colony appeared in 2004 at another nearby heronry at Casalbeltrame. These birds would mostly feed in the rice fields in the area, but would also migrate elsewhere during the summer, with the population at the roosts increasing in the winter. In 2008, the number of breeding ibis was estimated at 80-100 pairs, and at least 300 birds. That same year, 6 individuals, consisting of 3 pairs, were observed roosting at a heronry in Casaleggio Novara. By 2009 they were said to be one of the most characteristic animals of the rice-growing area of Novara and Vercellese. In 2010 the species was reported attempting to breed in the Po Delta, NE Italy. By 2014 reports of individuals and small flocks were recorded in various areas from the Po Valley down to Tuscany. Outside the Piedmont Region, cases of possible nesting are reported in Emilia-Romagna, Veneto and Lombardy. As of 2017 there do not seem to be coordinated control efforts in Italy.
Output:
How many more birds were there in 2008 compared to 1998?