Answer :

Nizux
It is simply asking you which  one increased the most from its last interval.

Answer : 4 | 2006 - 2012

From 1898 - 1971 it increased by 5

1971 - 1985 increased by 8

1985 - 2006 it increases by 10

2006 - 2012 it increased by 11 ( this is the answer because it increased the                                                         most  compared to the others)

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