1997

6.6

2000

7.6

2015

6.4

1980

6.6

1985

6.6

1999

6.6

2004

6.2

2008

7.2

2022

7.4

1975

6.8

1995

6.3

1998

5.8

1998

5.3

1988

6.5

1968

7.2

2022

6.0

2003

5.7

2009

7.3

1986

5.5

1994

7.3