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I was reading an article on [NHK easy
news](https://www3.nhk.or.jp/news/easy/k10012034021000/k10012034021000.html)
about whooping cough and I came across this sentence,
去年１年でこの病気になった人と同じぐらいです。I've seen this usage of "time duration" before but I
never understood why just saying 去年で wouldn't be sufficient/proper (or perhaps
it is. I'm not sure).

My question is what purpose is this for? If 去年 is already there, wouldn't the
reader know that the writer was referring to the people who got sick last
year?

Somewhat of a side question too, but is と's usage here used for comparing and
contrasting? This year vs last year. I don't believe its usage is for a
conditional and it isn't for connecting two nouns.

As always, thanks for any help that comes my way. I'm truly grateful.
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question
grammar
Why is １年 written after 去年１年 in this sentence?
I'd rather think it's like saying "with a total case of [integer] of whooping
cough reported in last year", where 'total' is sorta redundant.

去年 or 昨年 themselves don't necessarily refer to a whole calendar year,
especially for describing whooping cough, a seasonal epidemic. For example the
usage seen in "患者数は昨年末1週で44.6万人" in this
[news](https://scienceportal.jst.go.jp/news/newsflash_review/newsflash/2019/01/20190111_01.html)
is similar to something like "summer last year", "last year Christmas". Again,
you could think it as an extra, and a tradeoff between precision and succinct
that exists in many languages.
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answer
> 「国の研究所によると、今年１月から今月４日までに百日せきになった人が１万人以上になりました。 **去年１年** でこの病気になった人と同じぐらいです。」

The only reason that 「去年一年」is used instead of just 「去年」 is that the comparison
here is being made between a 12-month period (all of year 2018) and a 7-month
period (Jan. thru July, 2019).

Had the comparison been made between **two** 12-month periods, the author
would have just used 「去年」 (or "year XXXX").

The point of the sentence, as I am sure that you know by now, is to inform the
readers that the whooping cough is more widely-spread this year than last.
CC BY-SA 4.0
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answer