1991

7.6

1973

7.0

2000

8.1

1984

8.4

2003

7.1

2005

7.0

1992

6.9

1968

5.4

2022

7.6

2002

7.4

2006

6.1

1995

7.4

1993

6.5

1998

7.3

1979

7.0

1999

6.5

1999

7.4

1992

6.3

2003

5.3

2007

7.3