64In that regard, account must be taken of, inter alia, the market share held by the mark, how intensive, geographically widespread and long-standing use of the mark has been, the amount invested by the undertaking in promoting the mark, the proportion of interested parties who identify the product as originating from a particular undertaking because of the mark, statements from chambers of commerce and industry or other trade and professional associations as well as opinion polls (see, to that effect, Shape of a beer bottle, cited in paragraph 61 above, paragraph 44; see also, by analogy, Windsurfing Chiemsee, cited in paragraph 38 above, paragraph 51, and Philips, cited in paragraph 24 above, paragraph 60).