我想得到每一次指数成分股的全部列表，但是CSMAR上的数据列表只能下载一整年全部的数据列表（如果单独下载，每一次都要输入调整日期，并且每次调整日期不同，所以没有选择这种办法）。
或者是下面的例子中列出的，只有变化的数据。比如000016，上证50指数，只有指数最开始产生的时候（2004-01-02）是全部的50个公司，后面每半年调整一次，但是调整的时间不固定。而且列表中只给出了变动的数据，变量Chgsmp04代表的是每次调整的公司，“1”代表的是新增加的公司，“2”代表的是被剔除的公司，按照道理，每一次调整，新增和剔除的公司数量应该是相等的，保证为50家公司。
最终想要得到，每一次调整都是50家公司。即2004-07-01、2005-01-03等都是当时的指数成分股的50家公司。
最终还要处理000300（沪深300指数）、000905（中证500指数），即000016换成000300和000905。
求大神解答，非常感谢。
input str22 Indexcd str13 Chgsmp01 str19(Chgsmp02 Chgsmp03) str13 Chgsmp04
"000016" "2004-01-02" "600000" "浦发银行" "1"
"000016" "2004-01-02" "600004" "白云机场" "1"
"000016" "2004-01-02" "600006" "东风汽车" "1"
"000016" "2004-01-02" "600008" "首创股份" "1"
"000016" "2004-01-02" "600009" "上海机场" "1"
"000016" "2004-01-02" "600011" "华能国际" "1"
"000016" "2004-01-02" "600015" "华夏银行" "1"
"000016" "2004-01-02" "600016" "民生银行" "1"
"000016" "2004-01-02" "600018" "上港集箱" "1"
"000016" "2004-01-02" "600019" "宝钢股份" "1"
"000016" "2004-01-02" "600026" "中海发展" "1"
"000016" "2004-01-02" "600028" "中国石化" "1"
"000016" "2004-01-02" "600029" "南方航空" "1"
"000016" "2004-01-02" "600030" "中信证券" "1"
"000016" "2004-01-02" "600033" "福建高速" "1"
"000016" "2004-01-02" "600036" "招商银行" "1"
"000016" "2004-01-02" "600038" "哈飞股份" "1"
"000016" "2004-01-02" "600050" "中国联通" "1"
"000016" "2004-01-02" "600098" "广州控股" "1"
"000016" "2004-01-02" "600100" "清华同方" "1"
"000016" "2004-01-02" "600104" "上海汽车" "1"
"000016" "2004-01-02" "600171" "上海贝岭" "1"
"000016" "2004-01-02" "600221" "海南航空" "1"
"000016" "2004-01-02" "600350" "山东基建" "1"
"000016" "2004-01-02" "600569" "安阳钢铁" "1"
"000016" "2004-01-02" "600591" "上海航空" "1"
"000016" "2004-01-02" "600597" "光明乳业" "1"
"000016" "2004-01-02" "600601" "方正科技" "1"
"000016" "2004-01-02" "600602" "广电电子" "1"
"000016" "2004-01-02" "600609" "金杯汽车" "1"
"000016" "2004-01-02" "600637" "广电信息" "1"
"000016" "2004-01-02" "600642" "申能股份" "1"
"000016" "2004-01-02" "600643" "爱建股份" "1"
"000016" "2004-01-02" "600649" "原水股份" "1"
"000016" "2004-01-02" "600652" "爱使股份" "1"
"000016" "2004-01-02" "600664" "哈药集团" "1"
"000016" "2004-01-02" "600705" "北亚集团" "1"
"000016" "2004-01-02" "600717" "天津港"    "1"
"000016" "2004-01-02" "600795" "国电电力" "1"
"000016" "2004-01-02" "600805" "悦达投资" "1"
"000016" "2004-01-02" "600808" "马钢股份" "1"
"000016" "2004-01-02" "600811" "东方集团" "1"
"000016" "2004-01-02" "600812" "华北制药" "1"
"000016" "2004-01-02" "600832" "东方明珠" "1"
"000016" "2004-01-02" "600839" "四川长虹" "1"
"000016" "2004-01-02" "600863" "内蒙华电" "1"
"000016" "2004-01-02" "600887" "伊利股份" "1"
"000016" "2004-01-02" "600895" "张江高科" "1"
"000016" "2004-01-02" "600900" "长江电力" "1"
"000016" "2004-01-02" "600688" "上海石化" "1"
"000016" "2004-07-01" "600002" "齐鲁石化" "1"
"000016" "2004-07-01" "600005" "武钢股份" "1"
"000016" "2004-07-01" "600020" "中原高速" "1"
"000016" "2004-07-01" "600021" "上海电力" "1"
"000016" "2004-07-01" "600038" "哈飞股份" "2"
"000016" "2004-07-01" "600098" "广州控股" "2"
"000016" "2004-07-01" "600205" "山东铝业" "1"
"000016" "2004-07-01" "600221" "海南航空" "2"
"000016" "2004-07-01" "600597" "光明乳业" "2"
"000016" "2004-07-01" "600863" "内蒙华电" "2"
"000016" "2005-01-03" "600210" "紫江企业" "1"
"000016" "2005-01-03" "600500" "中化国际" "1"
"000016" "2005-01-03" "600637" "广电信息" "2"
"000016" "2005-01-03" "600652" "爱使股份" "2"
"000016" "2005-01-03" "600660" "福耀玻璃" "1"
"000016" "2005-01-03" "600664" "哈药集团" "2"
"000016" "2005-01-03" "600780" "通宝能源" "1"
"000016" "2005-01-03" "600805" "悦达投资" "2"
"000016" "2005-01-03" "600811" "东方集团" "2"
"000016" "2005-01-03" "600879" "火箭股份" "1"
"000016" "2005-07-01" "600006" "东风汽车" "2"
"000016" "2005-07-01" "600008" "首创股份" "2"
"000016" "2005-07-01" "600098" "广州控股" "1"
"000016" "2005-07-01" "600188" "兖州煤业" "1"
"000016" "2005-07-01" "600320" "振华港机" "1"
"000016" "2005-07-01" "600350" "山东基建" "2"
"000016" "2005-07-01" "600519" "贵州茅台" "1"
"000016" "2005-07-01" "600609" "金杯汽车" "2"
"000016" "2005-07-01" "600705" "北亚集团" "2"
"000016" "2005-07-01" "600797" "浙大网新" "1"
"000016" "2006-01-04" "600021" "上海电力" "2"
"000016" "2006-01-04" "600027" "华电国际" "1"
"000016" "2006-01-04" "600058" "五矿发展" "1"
"000016" "2006-01-04" "600177" "雅戈尔"    "1"
"000016" "2006-01-04" "600309" "烟台万华" "1"
"000016" "2006-01-04" "600428" "中远航运" "1"
"000016" "2006-01-04" "600569" "安阳钢铁" "2"
"000016" "2006-01-04" "600591" "上海航空" "2"
"000016" "2006-01-04" "600643" "爱建股份" "2"
"000016" "2006-01-04" "600812" "华北制药" "2"
"000016" "2006-04-24" "600002" "齐鲁石化" "2"
"000016" "2006-04-24" "600269" "赣粤高速" "1"
end