1986

7.6

1995

8.4

2002

6.9

1976

6.7

2014

5.5

1997

6.1

1997

6.5

2009

7.2

1999

6.2

1954

6.8

1991

6.1

1982

6.3

2001

5.5

1997

6.3

2005

5.6

2017

2.0

1996

6.5

2001

5.5

1989

6.0

1995

7.3