Classify the given a piece of financial news into three classes: positive, negative, and neutral. Output must be 'positive', 'negative', or 'neutral'.

Operating profit rose to EUR 13.5 mn from EUR 9.7 mn in the corresponding period in 2006 .
positive

Last year 's net sales rose to EUR 68.3 million from EUR 62.2 million .
positive

'' Our aim is to understand different traffic patterns based on the use of each building .
neutral