求教，下述代码如何简练的写出来，谢谢大神
use fix_point_data.dta, clear
keep if year==2003
save 2003.dta,replace

use fix_point_data.dta, clear
keep if year==2004
save 2004.dta,replace

use fix_point_data, clear
keep if year==2005
save 2005.dta,replace

use fix_point_data, clear
keep if year==2006
save 2006.dta,replace

use fix_point_data, clear
keep if year==2007
save 2007.dta,replace