1992

5.6

1997

7.3

1993

7.7

2004

6.2

2000

6.4

1999

7.4

1994

7.6

1998

8.3

2016

5.0

2014

6.5

1960

8.4

2001

7.4

1950

8.3

1987

8.1

1980

7.9

1997

6.5

1988

7.7

2004

7.4

1997

7.5

2024

9.0