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Which traffic source got hit the most? the second picture shows a huge spike in impressions during that time ... so I am guessing your organic traffic got hit the most, perhaps @Brendon could be right here?
There lies your problem @ErfanSafarpoor ! You could have redirected the 404s to the proper pages using 301s. By using disallow, you are basically asking Google to stop crawling that section of your site, ergo to forget all the previously done good work by you (since now in the eyes of the search engine, all the good ranking urls are either missing - 404s, or not allowed to be indexed - disallowed).
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