1991

7.1

1994

6.2

1958

7.6

2004

6.7

1988

6.2

2005

7.0

2017

4.8

2002

7.3

2007

6.1

2017

5.5

2009

6.5

1981

6.4

1997

6.4

2006

4.1

2019

6.6

2004

5.0

1991

6.3

1995

6.4

1989

6.5

1996

3.6