I don’t think there was Birchas Hachama in the year of yetziyas mitzrayim. Yetziyas Mitzrayim occured in the year 2448. If you add 28 years to it, and figure out all the years it was recited, you’ll see that it shouldn’t be recited this year – it would have been recited in 5752, and would be recited again in 5780.
