1998

7.3

2014

6.3

1968

6.9

1986

6.8

1994

6.2

1976

7.3

2006

6.1

2003

7.4

1985

6.5

2002

6.5

2005

6.4

1967

6.4

1989

6.3

2018

6.7

2007

7.9

1992

6.5

2019

6.7

2017

6.1

1992

7.0

1992

7.3