The government is searching for ways to encourage couples to procreate , but many japanese are putting off marriage and child-bearing until they are in their thirties or later .
日本政府目前正在寻找鼓励夫妇生育的办法,但很多日本人都将婚育年龄推迟到三十多岁甚至更大。
In 1934 , a team of economists came up with the first measurement of national income , which developed into what we now know as g.d.p. the late thirties saw a more rigorous and systematic collection of unemployment data .