Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Year | Place | Gold | Silver | Bronze |
| --- | --- | --- | --- | --- |
| 1970 | Phoenix | United States of America\nSally Carroll\nLucile Chambliss\nBarbara Hile | Soviet Union\nNadezda Ibragimova\nNina Rasskazova\nNina Stoliarova | Federal Republic of Germany\nOrtrud Feickert\nKarin Fitzner\nRuth Kasten |
| 1974 | Thun | Soviet Union\nGalina Zarikova\nZinaida Simonian\nNina Stoliarova | Czechoslovakia\nTereza Bohinska\nBedriska Hykova\nKatarina Pastorova | Australia\nJudith Harrison\nEnid Newton\nGloria Vause |
| 1978 | Seoul | Denmark\nKirsten Broge\nBonnie Bruun\nAase Havsteen | Australia\nJulie Aitken\nPatricia Dench\nLynne Uden | United States of America\nSally Carroll\nKimberly Dyer\nRuby Fox |
| 1982 | Caracas | Soviet Union\nMarina Dobrantcheva\nInna Rose\nAuksne Treinite | Hungary\nPalma Balogh\nMarta Kotroczo\nGabriella Kanyai | People's Republic of China\nJianmin Gao\nZhifang Wen\nCui Qing Yang |
| 1986 | Suhl | Soviet Union\nMarina Dobrantcheva\nIrina Kotcherova\nNino Salukvadze | France\nMartine Guepin\nEvelyne Manchon\nCorine Serra-Tosio | Albania\nDiana Mata\nEmanuela Delilaj\nEdlira Shyti |
| 1990 | Moscow | Soviet Union\nYauheniya Haluza\nMarina Logvinenko\nNino Salukvadze | Sweden\nKerstin Bodin\nBritt Marie Ellis\nChris Kajd | People's Republic of China\nHaiying Liu\nDuihong Li\nMeifang Qian |
| 1994 | Milan | People's Republic of China\nXiaoping Fan\nDuihong Li\nLina Wang | Korea\nSoon Hee Boo\nSun Bok Lee\nJung Hee Park | Belarus\nZhanna Shitik\nYauheniya Haluza\nYuliya Siniak |
| 1998 | Barcelona | People's Republic of China\nYeqing Cai\nLuna Tao\nYi Sun | Korea\nEun Kyung Shin\nSoon Hee Boo\nJoo Hyung Seo | Mongolia\nMunkhbayar Dorjsuren\nOyun Davaajantsan\nGundegmaa Otryad |
| 2002 | Lahti | People's Republic of China\nLuna Tao\nYing Chen\nDuihong Li | Russia\nIrina Dolgatcheva\nGalina Beliaeva\nSvetlana Smirnova | United States of America\nElizabeth Callahan\nRebecca Snyder\nSandra Uptagrafft |
| 2006 | Zagreb | People's Republic of China\nYing Chen\nFengji Fei\nDuihong Li | Belarus\nLiudmila Chabatar\nZhanna Shapialevich\nYauheniya Haluza | Germany\nMunkhbayar Dorjsuren\nStefanie Thurmann\nClaudia Verdicchio |
| 2010 | Munich | Russia\nYulia Alipova\nKira Klimova\nGalina Beliaeva | Serbia\nZorana Arunovic\nJasna Sekaric\nJelena Arunovic | Czech Republic\nLenka Maruskova\nMichaela Musilova\nPetra Hykova |
| 2014 | Granada | TBD | TBD | TBD |
| 2018 | Changwon | TBD | TBD | TBD |
Question:
how many world championships had the soviet union won first place in in the 25 metre pistol women's world championship?
Answer:
4