options nocenter; 
DATA firm; 
   INPUT fyear gvkey sale; 
   DATALINES; 
1993 1013 366.1180
1994 1013 448.7350
1995 1013 586.2220
1996 1013 828.0090
1997 1013 1164.4500
1998 1013 1379.6780
1999 1013 1926.9470
2000 1013 3287.9000
2001 1013 2402.8000
2002 1013 1047.7000
2003 1013 773.2000
2004 1013 784.3000
2005 1013 1169.2000
2006 1013 1281.9000
2007 1013 1322.2000
2008 1013 1456.4000
2009 1013 996.7000
2010 1013 1156.6000
1993 1034 338.2300
1994 1034 469.2630
1995 1034 520.8820
1996 1034 486.1840
1997 1034 500.2880
1998 1034 604.5840
1999 1034 732.4430
2000 1034 900.7940
2001 1034 974.9900
2002 1034 1230.7620
2003 1034 1297.2850
2004 1034 1339.4800
2005 1034 553.6170
2006 1034 653.8280
2007 1034 722.4250
proc print;
run;
proc forecast data=firm out=new lead=1 method=expo weight=.75 ; by gvkey;
id fyear;
var sale;
proc print data=new;
run;