2001

7.0

2003

4.1

2007

6.1

1996

6.9

1991

5.4

1990

5.6

1997

6.2

2005

6.2

2008

7.3

2001

6.6

2000

5.8

2006

6.7

2006

6.1

1976

7.8

2001

6.5

1991

6.4

2021

7.8

1999

6.6

2001

6.9

1984

6.9