2001

7.4

2003

7.8

1996

8.0

1997

7.5

2000

8.0

1998

7.2

1997

6.8

1990

6.2

2006

7.0

2025

6.4

2005

7.1

1996

6.8

1998

7.1

2016

5.6

1970

7.2

1965

6.9

1967

6.9

1989

6.3

1973

7.5

1995

5.9