Table schema:
CREATE TABLE table_168274_1 (index_weighting___percentage__at_17_january_2013 VARCHAR, company VARCHAR)

Question: 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"