South West France (wine region) the grapes to be harvested earlier and the wines to be of a stronger alcohol level. Many Bordeaux wine merchants saw the wines of the "High Country" as a threat to their economic interest and during the 13th & 14th century a set of codes, known as the "police des vins", were established which regulated the use of the port of Bordeaux for wine trading. The "police des vins" stated that no wine could be traded out of Bordeaux until the majority of Bordelais wine had already been sold. This had a devastating effect on the wine industry of the
Margaret River (wine region) with only 200 millimetres of the annual 1160 millimetres falling between October and April. The low diurnal and seasonal temperature range means an unusually even accumulation of warmth. Overall the climate is similar to that of Bordeaux in a dry vintage. Although the region produces just three percent of total Australian grape production, it produces over 20 percent of Australia's premium wine market. The principal grape varieties are fairly evenly split between red and white; Cabernet Sauvignon, Chardonnay, Sauvignon blanc, Sémillon, Shiraz, Merlot, Chenin blanc and Verdelho. There are no official Margaret River subregions, although in 1999 viticultural scientist Dr