在做线图的时候，按照每一年分城乡统计均值，想在图中把每一年均值的数字标签表示出来，应该怎么写命令？
这是我原来的命令

graph twoway line x year ,by(chengxiang)connect(line)clpattern (longdash) lcolor (grey) legend(row(3)position(10)ring(0))xtitle("") ytitle("Mean total number of children")xlabel(2012 2013 2015 2017)ylabel(minmax)yaxis(1 2) saving(Fig_m1,replace)


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