Jews in Hungary interwar statistics (1896-1938)

The net loss for Judaism due to official conversions was 26,652 people between 1919 and 1938: while 4,288 people converted into the faith, 30,940 left it. The endpoints of this period, 1919-1920 (white terror) and 1938 (anti-Jewish law) contributed to more than half of this loss; between 1921 and 1930, the net loss rested around pre-war levels (260 people/year).:

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Reference 1: # of years totaled, converted from Judaism and converted to Judaism.

Reference 2: 1896-1900 (pre-ww1 borders), 1901-1910 (pre-ww1 borders), 1911-1917 (pre-ww1 borders), 1919-1920, 1921-1930, 1931-1937 and 1938 alone.

Source: http://en.wikipedia.org/wiki/History_of_the_Jews_in_Hungary