1997

+1.50%

1998

+2.40%

1999

+1.60%

2000

+5.60%

2001

+4.90%

2002

+4.60%

2003

+3.50%

2004

+2.20%

2005

+2.50%

+4.00%

2007

+4.90%

+4.10%