1979

6.3

2004

6.7

2004

7.2

1992

5.8

1997

6.2

1999

6.2

2003

6.7

2009

4.9

2001

5.8

1984

6.3

1962

5.9

1982

5.4

2018

6.3

1985

6.1

2020

6.1

2002

6.4

1999

6.6

2022

5.9

1999

4.7

2005

6.9