2011

8.1

2009

8.0

2010

7.9

2001

7.0

1993

6.6

1995

7.1

1968

7.1

2000

2.0

1999

7.3

1991

0.0

1962

7.0

1983

6.3

1972

7.0

1992

7.5

2019

6.4

2000

7.6

2002

8.6

2006

7.9

2005

7.9

1987

7.1