1998

6.9

2004

7.3

2007

6.4

1988

7.8

2001

7.4

1969

7.6

1990

7.8

1987

8.1

1970

2.8

2014

6.0

1994

7.4

1989

6.0

2016

6.2

2005

7.1

2003

7.6

1986

0.0

1971

7.2

1939

7.6

1993

6.3

1981

7.1