account for在这句话里是什么意思?

问题描述:

account for在这句话里是什么意思?
3% of companies accounted for 6 million of the 7.7 million jobs that were added to the economy between 2001 and 2005.
account for在这句话是什么意思
全句该怎么翻译?

占多少比例的意思,整句话大概是:2001-2005年间增加的770万工作岗位中,全部企业中3%的企业就占了其中600万.