Rogernomics, however, has been credited with a number of other positive impacts on the New Zealand economy: inflation, which had reached a high of 17.15% in 1980, has been in single digits every year since the end of Douglas' tenure as finance minister; and income tax rates were halved, while gross national income per capita almost doubled, from $6,950 USD in 1984 to $13,640 USD in 1990. Other supporters of Rogernomics have argued that many statistics don't take into account the improvements in consumer goods it brought, transforming New Zealand from a country where permits were needed to buy overseas magazines, and where prices were high and choice was limited, into a country with a range of consumer goods available similar to those enjoyed by other western democracies. Douglas himself has claimed that the unwillingness of subsequent governments to alter any of his reforms is a testament to their quality.