In 1930, the armed forces forced the Radicals from power and improved economic conditions, but political turbulence intensified. In 1932, Argentina required immigrants to have a labour contract prior to arrival, or proof of financial means of support. The Roca-Runciman Treaty of 1933 gave Argentina a quota of the British market for exports of its primary products, but the discriminatory British imperial tariffs and the effects of deflation in Britain actually led to a small decline of Argentine exports to Great Britain.