You will be given a definition of a task first, then some input of the task.
This task is about writing a correct answer for the reading comprehension task. Based on the information provided in a given passage, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.

Passage: Bern has a population of 140,634 people and 34% of the population are resident foreign nationals. Over the 10 years between 2000 and 2010, the population changed at a rate of 0.6%. Migration accounted for 1.3%, while births and deaths accounted for 2.1%. Question: What counted for more of the population change?
Output:
births and deaths