1969

6.6

2008

6.1

1963

7.1

1993

6.1

1964

7.3

1968

6.5

2003

6.0

1989

7.1

2005

5.7

2009

6.3

1951

6.7

1971

6.4

2007

6.6

1989

5.9

1955

7.2

1989

6.4

1974

6.4

2001

5.8

1994

7.0