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How do you select a transformer to operate in an ambient higher than 40 degrees centigrade?

When the ambient exceeds 40 deg. C use the following chart for de-rating standard transformers.      Maximum Ambient Temperature    Maximum Percentage of Loading 40 deg. C (104 deg. F )                                   100% 50 deg. C (122 deg. F)                                    92% 60 deg. C (140 deg. F)                                    84% Instead of ordering custom built transformers to operate in ambient...