2004

8.0

1979

7.7

2007

6.4

2006

7.9

2000

7.4

2018

4.8

2002

6.3

1998

6.7

2001

6.6

1991

6.4

2015

7.0

1986

6.4

1989

6.2

1995

7.7

1955

7.4

1969

7.0

1993

6.0

2010

7.8

1988

6.2

1999

6.6