  
<prompt> Mean number of months between marriage and first birth for ever-married women age 15-49 for the survey years 1990, 1997, 2002, 2007, 2009, and 2012, with 95% confidence intervals
  
 [[1990, 20.3], [1997, 21.5], [2002, 23.3], [2007, 28.3], [2009, 20.6], [2012, 22.3]] 
 <response> As shown in the figure, except for a significant jump in 2007 to a mean of 28.3 months, this mean has remained relatively unchanged, in a range from 20.3 to 23.3 months.  