1974

3.5

1995

2.8

1994

7.0

2019

6.7

2005

6.5

1979

7.8

1997

7.2

2002

6.4

2022

10.0

2017

6.3

1940

8.3

1964

8.1

1987

6.9

2005

7.4

2007

6.1

1991

6.2

1990

6.7

1993

5.5

1999

7.4

2017

5.0