1955

7.3

1956

7.1

1994

7.2

2000

5.3

1998

7.4

1998

6.6

1985

5.4

2005

4.6

1993

4.4

1984

6.1

2003

6.3

2004

6.2

2009

7.2

1980

7.8

1997

6.8

2008

7.0

1955

3.0

2016

10.0

2008

6.7

1965

7.0