1975

6.5

2012

6.4

1988

7.3

1964

7.0

1997

6.5

2021

6.7

2019

7.4

1985

7.2

1977

6.2

1983

6.2

1984

7.2

2005

7.1

2006

6.8

1969

7.0

1965

7.5

2002

6.0

1982

5.7

1990

5.3

2024

7.0

1953

6.8