1973

7.4

1998

7.2

1992

7.5

1956

6.1

1992

7.4

2006

6.6

1969

7.8

2001

5.9

1989

6.6

1974

4.8

2014

7.1

2000

5.0

1968

3.7

1986

4.5

2002

4.7

2007

6.7

2023

8.1

1997

6.0

1980

6.3

1967

6.0