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This helper template calculates periods for Danish certifications, as stated in the following sources:
- [1] - Album level changed in 1994
- [2] - levels changed in April 2003
- [3] - new levels for albums and singles in February 2007
- [4] - new levels for singles changed in April 2009
- [5] - new albums levels change in 7 January 2011
- [6] - new single levels from 17 November 2014
- [7] - new single levels from 1 April 2016
It returns:
| Before 1994
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Before April 2003
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Before February 2007
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Before April 2009
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Before 7 January 2011
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Before 17 November 2014
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Before 1 April 2016
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From 1 April 2016
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| 1
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2
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3
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4
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5
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6
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7
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8
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Returns 0 if the data provided is not sufficient.
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