1962

6.0

1993

7.8

1990

7.4

1998

7.0

2000

8.2

2005

8.7

2004

8.1

2006

7.8

1999

7.8

1994

7.0

1982

6.8

2001

7.6

1964

7.8

2012

7.2

2013

7.6

1984

8.1

2012

8.0

2001

7.9

1996

7.9

1968

7.7