Why is Japanese fertility upturning? Observing through marital fertility and nuptiality

I have proposed a marital fertility measure, ETFR or ever-married total fertility, defined by TFR／TFMR，where TFR is the total fertility rate, and TFMR the total first marriage rate（Hirosima and Bando,1991; Ohtani,1993). Using this measure, the decomposition of the increase in the TFRs from 2005(1.26) to 2010 (1.39) shows that 90.9 percent of the increase is accounted for by the increase in the first marriage rate and only 9.1 percent by that in marital fertility.
The upturn of the first marriage rate by age occurred not only at 30's but also at the latter half of 20's of women, which suggests not only the recuperation but also a change in marriage market, considering the everlasting deteriorating economic situation.
The increase in the first marriage rate is more remarkable in large metropolitan areas and in south west Japan where the traditional gender role model prevails less. The regional aspect of marriage rate increase provides another evidence of the marriage market change.
The economic situation has been breaking the conventional male breadwinner model, and women earning higher income are getting favorable situation rather than unfavorable one. This can be one of the main causes of marriage hence fertility increase in Japan.