2004

7.2

1995

6.2

1999

7.4

2012

8.1

2006

6.6

1991

7.8

2011

7.8

2019

8.0

1993

8.4

2005

8.1

2018

7.0

1975

7.3

2003

7.9

1980

7.2

2019

6.6

2009

7.5

1987

8.4

2002

6.3

1960

7.6

1993

6.8