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Just a few minutes ago I sat down with some of my staff members and started talking about some of the horribly tragic events that Osama bin Laden and his terrorist allies have perpetrated over the past couple of decades , and I thought it appropriate that we take a moment as we reaffirm our strong commitment , as the President has said , to win this war on terrorism , and look at what led up to that tragic day 1 year ago . I think that is what we have learnt in Australia in the past couple of decades that societies can be changed , that an inward looking culture can be made outward looking , that what seems alien can be revealed as friendly , that where threats always seemed to lie there are now rewards and opportunities . The past couple of decades have seen enormous improvement in the kind of facilities and services that we offer . The past couple of decades have seen an important shift away from socialist and collectivist economic values in favor of personal enrichment . So the overall development of the features of a hearing instrument has not been dramatic over the past couple of decades .