1993

7.4

2000

7.0

1990

8.5

1972

7.1

1972

7.8

2005

7.1

1984

7.5

2004

7.2

1988

7.2

1981

2.8

1970

3.8

1998

7.2

2006

6.8

1997

6.8

2006

7.3

2020

5.9

2018

5.5

2024

6.4

1976

6.6

2007

7.9