1959

7.8

1997

7.5

1980

7.9

1996

7.4

1960

7.7

2005

6.8

1995

7.0

2000

6.9

2002

7.2

2011

6.0

1957

8.5

1988

7.2

1992

4.0

1995

6.3

1997

6.1

2020

6.3

1981

6.5

1997

0.0

2021

7.1

1992

7.5