1971

7.0

2012

4.5

2000

7.2

2004

6.0

2022

7.8

2003

6.2

1983

6.7

1964

7.4

2001

6.4

1996

5.7

2011

7.2

1995

6.8

1976

7.5

1986

5.6

2004

5.8

1988

6.5

1990

7.4

1999

5.6

1987

7.6

1984

6.6