Wine exports are up for 2010, but grape harvests have fallen as growers trim yields because of oversupply last year. Exporters are getting much less for each litre of wine, according to New Zealand Winegrowers' annual report released yesterday. It shows a 5 per cent increase in exports pushed revenues to a record $1.04 billion for the year ending June 30. But at the same time, the grape harvest fell 7 per cent to 266,000 tonnes.