Total number of female employees in company L in 2004, 2005, 2006 and 2007 =145+183+191+234=753
Total number of female employees in company T in 2004, 2005, 2006 and 2007 =121+178+162+198=659
∴ Requried percentage =753−659659×100=94659×100=14.26%≈14%