1983

6.4

1986

5.6

1999

5.3

2001

5.8

2014

7.3

2021

1.5

1988

7.5

1955

7.5

2002

6.3

2004

6.8

1971

7.4

1993

7.0

1980

7.9

1996

5.9

2003

6.5

1990

6.4

2000

6.6

1974

6.7

1977

5.6

1986

7.0