2001

6.1

2008

5.6

1988

6.4

2002

6.8

1991

5.3

2000

3.8

2005

5.2

1998

0.0

1997

6.6

1998

5.8

1997

7.6

2005

5.0

2022

7.0

2008

7.0

1980

7.0

2004

4.8

2006

6.3

1978

5.6

2008

3.8

1994

6.5