1989

7.1

2006

7.0

1985

4.4

1998

7.5

2007

6.0

2002

7.4

1989

6.4

1989

7.3

1962

7.7

2004

7.2

1988

8.4

2003

6.3

1965

6.7

1963

7.9

1990

7.5

2009

5.0

1989

5.1

2010

5.6

1974

7.0

2013

6.6