1994

8.3

1976

8.1

1998

7.8

1986

7.6

1995

8.4

1974

7.9

1988

7.5

1993

6.3

1999

6.8

1997

7.8

1997

6.8

2001

5.9

1978

7.2

2002

5.4

2001

7.5

2018

5.9

1929

7.5

1995

7.9

1971

7.4

2008

8.5