2009

6.3

1987

6.8

1977

6.6

2008

6.5

2002

5.4

2008

6.3

1995

5.4

2002

6.0

2017

6.8

1992

5.6

1999

6.8

2021

6.5

2004

6.0

2007

7.6

1998

6.4

2001

5.6

1985

6.2

1998

7.3

1971

6.0

1986

5.8