1984

6.3

2005

8.2

1995

6.1

2013

7.3

2021

7.2

1991

7.7

1992

7.0

2002

7.3

1993

7.1

1996

6.9

2019

1.0

1962

7.0

1989

7.9

2001

7.2

1999

7.9

1983

6.3

2004

7.4

1972

6.9

1992

7.5

2021

6.7