CREATE TABLE table_168274_1 (index_weighting___percentage__at_17_january_2013 VARCHAR(255), company VARCHAR(255))
Name the total number of index weighting % at 17 january 2013 for bouygues
    
SQL: SELECT COUNT(index_weighting___percentage__at_17_january_2013) FROM table_168274_1 WHERE company = "Bouygues"