input str10 Accper
"12/31/2012"
"12/31/2014"
"12/31/2010"
"12/31/2016"
"12/31/2011"
"12/31/2013"
"12/31/2015"
"12/31/2009"
"12/31/2010"
"12/31/2013"
"12/31/2014"
"12/31/2011"
"12/31/2015"
--more--

gen year=. replace year=1 if Accper=="12/31/2009" replace ye
> ar=2 if Accper=="12/31/2010" replace year=3 if Accper=="12/3
> 1/2011" replace year=4 if Accper=="12/31/2012" replace year=
> 5 if Accper=="12/31/2013" replace year=6 if Accper=="12/31/2
> 014" replace year=7 if Accper=="12/31/2015" replace year=8 i
> f Accper=="12/31/2016"  
invalid 'replace'
r(198);