1979

6.9

1987

7.6

1972

4.2

1984

8.4

1990

7.5

2002

7.1

1991

7.9

1992

7.4

1992

7.0

1997

6.5

2019

6.8

2016

7.1

2017

7.3

2023

6.5

1982

6.2

2000

6.1

1961

7.5

2006

7.2

2008

6.3

1984

6.8