1978

6.9

2007

6.2

1984

6.3

1987

7.4

2009

5.6

1985

7.2

2012

6.5

2008

5.4

1999

6.3

2015

7.8

1994

6.6

1970

6.4

2008

5.6

1991

6.2

1969

7.8

2017

5.4

2001

6.2

1984

7.1

2006

7.5

2022

7.3