1998

6.2

1996

5.4

2010

6.4

1993

5.9

1980

8.2

1981

7.5

1995

7.0

1990

7.5

2006

5.9

1960

7.3

2013

6.0

1972

6.2

1999

6.8

2002

4.7

2022

5.5

2023

6.9

1962

7.9

1972

7.1

1987

7.3

2005

5.1