1995

7.1

1986

8.0

2002

7.4

2011

9.0

2005

7.8

1996

8.5

1994

8.2

2005

7.3

2018

6.2

2019

5.9

1986

7.9

1966

7.4

2001

6.6

1984

7.1

1981

8.0

2003

8.1

2014

8.5

2003

7.5

2004

7.0

2006

7.6