It was reported by the Secretariat that district (_okrug_) party committees after the Ninth Party Congress showed improvement in "content, style and methods of their work," and that they understood better the political approach in guiding local economic tasks as well as leading primary party organs in the political and organization work of their constituencies. Furthermore, over 77 percent of full-time secretaries of local party committees and about 90 percent of chairmen of cooperative farms had higher or secondary education. Formal training as well as in-service education was given serious attention. Educational training for party members includes two-year university courses, short courses, seminars, informal meetings, and conferences of local party committees. Statistics reported in 1971 showed that 25.2 percent of about 700,000 members of the BKP were women. Increasingly more important positions were assigned to women in the party hierarchy. In the same period (1971) there was a woman member of the Politburo, several women members of the Central Committee, and two women ministers. Not only were women active in party activities, but they could also be found in boards of management of government enterprises. Party Congresses Party statutes formerly stipulated that congresses would be held every four years, but a decision was made to extend the interval to five years after the Communist Party of the Soviet Union had made the same change. Decisions of the congresses appear as party statutes that usually reflect the desires of the leadership and the circumstances that necessitated the additions, deletions, or amendments to already existing statutes. The most important innovations embodied in BKP statutes emerged from congresses beginning with the Sixth Party Congress, held in 1954, and continuing through the Tenth Party Congress, held in 1971. The Sixth Party Congress abolished the position of general secretary and in its place created the post of first secretary, again following the lead of the Soviet party, which had done the same thing after Stalin's death a year earlier. Party leader Chervenkov, who was premier and a Politburo member, kept those posts and allowed the election of Zhivkov as first secretary. Zhivkov was then an unknown functionary who had risen from the ranks of the Sofia party structure. Aside from the usual exhortation for party unity and the changes in six Politburo positions as well as an increase in Central Committee membership, the Sixth Party Congress was uneventful. Zhivkov's rise to power did not take place immediately, and a period of intraparty struggle ensued as he gradually consolidated his authority as first secretary.