| 11. | This is based on the 1961-1990 base period; recent years have tended to be warmer in this area.
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| 12. | The base period with an index value of 100 was set is the week ended March 16, 1990.
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| 13. | The base period, when the indexes were set to 100, is still the week ended March 16, 1990.
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| 14. | The base period, with an index value of 100, was set in the week ended March 16, 1990.
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| 15. | The base period with an index value of 100 was set in the week ended March 16, 1990.
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| 16. | "One reason is the base period for comparison last year reached its peak in October, " he said.
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| 17. | The base period was the week ended Nov . 18, when the indexes were set at 100 . 0.
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| 18. | The exact amount of workers'benefits are based on how much they earned during a 12-month " base period ."
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| 19. | This means that the index is based on a base period on a specific base day for its calculation.
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| 20. | The trade weights are not updated monthly; as of March 2016, the base period was the average over 2011-13.
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